展开 15(3x-1)-7(x-1=2(1+9x))

解答

展开

15 (3 x - 1) - 7 (x - 1 = 2 (1 + 9 x))

38 x - 8 = 2 + 18 x

求解步骤

15 (3 x - 1) - 7 (x - 1 = 2 (1 + 9 x))

= 15 (3 x - 1) - 7 (x - 1 \cdot 2 = (1 + 9 x))

乘开

15 (3 x - 1) : 45 x - 15

= 45 x - 15 - 7 (x - 1 = 2 (1 + 9 x))

乘开

- 7 (x - 1 = 2 (1 + 9 x)) : - 7 x + 7 = 2 + 18 x

45 x - 15 - 7 x + 7 = 2 + 18 x

乘开

45 x - 15 - 7 x + 7 : 38 x - 8

38 x - 8 = 2 + 18 x

e x p an d \frac{n ( n - 1 ) ( n + 1 )}{3}

e x p an d (x + h)^{(2)} - 3

e x p an d \frac{n T}{s ( R ( M + n ^{2} J ) s + TB )}

e x p an d 10 x - (2 x + 9 = - 3 (15 - 4 x))

e x p an d - \frac{4 ( 11 + 341 )}{11}