Question

Решите ример по действиям-3 1.2*2.5-3.8*12.5+1*3.10

Answer 1

1) -31,2*2,5=78
2)-3,8*12,5=-47,5
3)1*3,10=3,1
4)78-(-47,5)=125,5
5)125,5+3,1=128,6
Ответ: 128,6

Answer 2

To solve the expression -3 + 1.2 * 2.5 - 3.8 * 12.5 + 1 * 3.10, we can follow the order of operations, also known as PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction):

1. First, we perform the multiplications and divisions from left to right: - Multiply 1.2 by 2.5: 1.2 * 2.5 = 3.0 - Multiply 3.8 by 12.5: 3.8 * 12.5 = 47.5

2. Next, we perform the additions and subtractions from left to right: - Subtract 3 from -3: -3 - 3 = -6 - Add the previous result to the result of the previous multiplication: -6 + 3.0 = -3.0 - Subtract the previous result from the result of the other multiplication: 47.5 - (-3.0) = 50.5 - Add 1 multiplied by 3.10 to the previous result: 50.5 + 3.10 = 53.6

Therefore, the value of the expression -3 + 1.2 * 2.5 - 3.8 * 12.5 + 1 * 3.10 is 53.6.