化简-0.5(7.5)^2+2.5(7.5)+4.5

解答

化简

- 0.5 (7.5)^{2} + 2.5 (7.5) + 4.5

- 4.875

求解步骤

- 0.5 \cdot 7. 5^{2} + 2.5 (7.5) + 4.5

- 0.5 \cdot 7. 5^{2} = - 28.125

2.5 (7.5) = 18.75

= - 28.125 + 18.75 + 4.5

数字相加:

- 28.125 + 18.75 + 4.5 = - 4.875

= - 4.875

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