Asking a question 01 Type the question and press Enter , or press the search button. An empty box shows example chips by category, and one click runs the example. 02 Check the reading before the result. The strip above the answer names the intent kind, a confidence figure and a plain restatement; if it guessed wrong, open "Not what you meant?" and pick another candidate. 03 Read the card, then the details. The card holds the primary value and a copy button; below it come the parsed input, formulas and alternate forms, and an action button to the matching tool. 04 Rerun from Recent questions. The last 20 questions stay listed; click one to rerun, or clear them. 05 When a question is not understood, the failure card repeats the error, lists supported families, and suggests pages from the site search. Worked questions Every row reproduces on this page; the card prints these strings exactly.
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Result card
Details
derivative of x^2 sin x2*sin(x)*x+cos(x)*x^2Simplified (2*sin(x)+cos(x)*x)*x
integral of x^2 from 0 to 11/3 Decimal 0.3333333333 ; antiderivative (1/3)*x^3 + C
15% of 20030 Formula 200 × 15% = 200 × 0.15; remainder 170
convert 5 km to miles3.106855961 mile 1 km = 0.6213711922 mile
100 usd to cny710 CNY 1 USD = 7.1 CNY; offline table
mean and sd of 1 2 3 4n=4, mean=2.5, sd=1.290994449, median=2.5 Two named statistics produce this summary row
days between 2026-01-01 and 2026-10-01273 days 39 weeks; 6552 hours
monthly payment on a 100000 loan for 5 years at 4.9%1882.5454 60 payments; total interest 12952.72119
Date answers count whole local days and exclude the start: 2026-10-01 after 45 days lands on 2026-11-15 .
Choosing among readings Before any rule sees the text, the page normalises it: full-width characters and superscripts become keyboard syntax, Chinese numerals and currency words are converted, word operators are rewritten, and dates and unit words in either language are resolved. Rules then propose candidate readings — a derivative, a percent-of, a unit conversion, a statistic, a date span, a loan payment — each with a confidence from 0 to 1, a pattern identifier and a restatement. Only the top-ranked reading is computed until you choose another. Execution reuses the site's engines, so the arithmetic matches the linked panel.
Where the answers stop
The grammar is finite. Only the listed patterns are recognised, and prose outside them fails cleanly instead of guessing: I want to know the capital of France replies "Could not understand the question"; an unsupported probability phrase names the models that work.
The printed digits are display precision. Most cards round to 10 significant digits, evaluation to 14; the definite integral reads 0.3333333333 , and the sample SD keeps a different population value beside it.
Currency is an offline reference table. 100 usd to cny reads 710 CNY from a table whose source line says "Built-in static reference rate (offline, not live)"; the action button opens the converter for live rates.The confidence badge is a ranking score The percentage beside the reading ranks the rule that matched; it is not the chance that the reading is right. On roll 2 dice sum is 7, the dice rule wins at 94% and computes 0.16666667 (6/36), while a "sum of these numbers" reading sits one point behind at 93%; choose that alternative and the page returns 9 . Low scores can still be intended: x^2-4=0 is treated as an equation at 80% and returns x = 2, x = -2. Read the restated sentence before trusting the first match.
Where it fits Checking a line of homework derivative of x^2 sin x returns 2*sin(x)*x+cos(x)*x^2; the rule-by-rule version is on Step-by-step .
Converting and pricing on the fly convert 5 km to miles reads 3.106855961 mile ; 100 usd to cny reads 710 CNY from the offline table, and the card opens the currency converter .
Reading numbers out of a sentence standard deviation of 2 4 4 4 5 5 7 9 returns the sample SD 2.138089935 with the population SD 2 beside it; gcd(48,18) returns 6 with the LCM 144 .
Sanity-checking a loan quote monthly payment on a 100000 loan for 5 years at 4.9% returns 1882.5454 over 60 payments and 12952.72119 total interest; the card opens the loan calculator .
Privacy Parsing and computation happen in your browser. The only request that can leave the machine is the optional model rewrite, to the HTTPS endpoint you configure with your own key; questions and settings are stored locally and can be cleared.
References
BIPM, The International System of Units (SI) , 9th edition, bipm.org （访问日期：2026-10-01）— the unit system behind the conversion answers.
NIST, Guide for the Use of the International System of Units (SI) , NIST SP 811, nist.gov （访问日期：2026-10-01）— factors such as 1 km = 0.6213711922 mile.
NIST/SEMATECH, e-Handbook of Statistical Methods , §1.3.5.2, itl.nist.gov （访问日期：2026-10-01）— sample (÷ n − 1) versus population (÷ n) spread.
Ecma International, ECMAScript Language Specification , Number type （访问日期：2026-10-01）— binary64 storage.
MDN Web Docs, Date （访问日期：2026-10-01）— local calendar days in date answers.
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Reviewed by CalcX Editorial Team
Updated 2026-10-01