展开 1.25(4x-10=7.5)

解答

展开

1.25 (4 x - 10 = 7.5)

5 x - 12.5 = 7.5

求解步骤

1.25 (4 x - 10 = 7.5)

= 1.25 (4 x - 10 \cdot 7.5 =)

使用分配律:

a (b - c) = ab - a c

a = 1.25, b = 4 x, c = 10 = 7.5

1.25 \cdot 4 x - 1.25 \cdot 10 = 7.5

4 \cdot 1.25 x - 10 \cdot 1.25 = 7.5

乘开

4 \cdot 1.25 x - 10 \cdot 1.25 : 5 x - 12.5

5 x - 12.5 = 7.5

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e x p an d \frac{9}{( s + 3 ) ( s + 4 )}

e x p an d v (- 2, - 1)