Phần hướng dẫn bên dưới chưa có bằng tiếng Việt nên được hiển thị bằng tiếng Anh. Bản thân máy tính đã được dịch đầy đủ.
Cách sử dụng máy tính này
- Click the keys or type directly. You can type expressions like 2sin(30)+√16 or (1+5%)^10.
- Press = or Enter to calculate, and Esc to clear. The result preview updates as you type.
- Switch between degrees (DEG) and radians (RAD) for trigonometric functions. Inverse trig functions have their own keys; press 2nd to turn sinh, cosh and tanh into their inverses.
- For roots, √x is the square root, ³√x the cube root, and ʸ√x any root: enter the index first, then ʸ√x and the number (3 ʸ√x 8 = 2). EXP enters powers of ten (3 EXP 5 = 3 × 10⁵), and RND inserts a random number between 0 and 1.
- Use MS to store a value, M+ and M− to add to or subtract from memory, MR to recall and MC to clear. Ans inserts the last result.
Công thức
Expressions follow standard mathematical order of operations: parentheses first, then factorials and percentages, then exponents (evaluated right to left), then unary minus, then multiplication and division, and finally addition and subtraction. Calculations use 40-digit decimal arithmetic, so results like 0.1 + 0.2 are exactly 0.3.
−2² = −(2²) = −4
2^3^2 = 2^(3^2) = 512
2π = 2 × π (implicit multiplication)
Examples
- sin(30) in degrees = 0.5
- log(1000) = 3; ln(e) = 1
- 5! = 120; ³√(−8) = −2; 4 ʸ√x 81 = 3
- 50% = 0.5, so 200 × 15% = 30
- 1 ÷ 4 EXP 2 = 1 ÷ 400 = 0.0025
Câu hỏi thường gặp
Why does sin(90) give 0.893997…?
The calculator is in radian mode. Press the RAD/DEG key to switch to degrees, where sin(90) = 1.
How does the % key work?
% divides the preceding number by 100, so 15% = 0.15 and 200 × 15% = 30. To add 15% to 200, enter 200 × (1 + 15%).
Is my calculation history saved?
History is stored only in your browser's local storage on this device. It is never sent to a server, and you can clear it at any time.
What keyboard shortcuts are supported?
Type digits, + − * / ^ ( ) ! %, function names like sin, cos, ln, sqrt, and constants pi and e. Enter evaluates, Esc clears and Backspace deletes.