Question

18 7\12(-2 2\5+3в)-31 8\15(-7 1\2+3в)+3(12,95в+2,7)

Answer 1

Ответ:

200

Пошаговое объяснение:

Answer 2

To solve the expression, let's break it down step by step:

1. Simplify the fractions within the parentheses: -2 2/5 = -12/5 3/5 = 3/5

The expression now becomes: 18 7/12(-12/5 + 3/5) - 31 8/15(-7 1/2 + 3/5) + 3(12.95 + 2.7)

2. Perform the additions within the parentheses: -12/5 + 3/5 = -9/5 -7 1/2 + 3/5 = -15/2 + 3/5

The expression becomes: 18 7/12(-9/5) - 31 8/15(-15/2 + 3/5) + 3(12.95 + 2.7)

3. Convert mixed numbers to improper fractions: 18 7/12 = (18 * 12 + 7) / 12 = 223/12 31 8/15 = (31 * 15 + 8) / 15 = 473/15

The expression now becomes: (223/12)(-9/5) - (473/15)(-15/2 + 3/5) + 3(12.95 + 2.7)

4. Perform the multiplications: (223/12)(-9/5) = (-223 * 9) / (12 * 5) = -2007/60 (473/15)(-15/2 + 3/5) = (473/15)(-30/4 + 3/5) = (473/15)(-75/10 + 12/10) = (473/15)(-63/10) = -238/2

The expression simplifies to: -2007/60 - 238/2 + 3(12.95 + 2.7)

5. Simplify the addition and subtraction of fractions: -2007/60 = -669/20 -238/2 = -119

The expression becomes: -669/20 - 119 + 3(12.95 + 2.7)

6. Perform the additions and multiplications: 12.95 + 2.7 = 15.65 3(15.65) = 46.95

The final simplified expression is: -669/20 - 119 + 46.95

To further simplify the expression, we need to convert -669/20 to a decimal value.