展开 6(3k+5=39)

解答

展开

6 (3 k + 5 = 39)

18 k + 30 = 39

求解步骤

6 (3 k + 5 = 39)

= 6 (3 k + 5 \cdot 39 =)

使用分配律:

a (b + c) = ab + a c

a = 6, b = 3 k, c = 5 = 39

6 \cdot 3 k + 6 \cdot 5 = 39

乘开

6 \cdot 3 k + 6 \cdot 5 : 18 k + 30

18 k + 30 = 39

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e x p an d 2 (x - 5) + 4 (x - 1 = 0)

e x p an d \frac{x ^{2} + 4 a x}{( x + 2 a ) ^{2}}