展开 3(1-3x=2(-4x+7))

解答

展开

3 (1 - 3 x = 2 (- 4 x + 7))

3 - 9 x = - 8 x + 14

求解步骤

3 (1 - 3 x = 2 (- 4 x + 7))

= 3 (1 - 3 \cdot 2 = x (- 4 x + 7))

使用分配律:

a (b - c) = ab - a c

a = 3, b = 1, c = 3 x = 2 (- 4 x + 7)

3 \cdot 1 - 3 \cdot 3 x = 2 (- 4 x + 7)

化简

3 \cdot 1 - 3 \cdot 3 x = 2 (- 4 x + 7) : 3 - 9 x = - 8 x + 14

3 - 9 x = - 8 x + 14

e x p an d (0, - 4) y (5, 2)

e x p an d \frac{1}{( 1 - tan ^{2} ( x ) ) ^{2}}

s im pl i f y e^{2 (x + y i) + i}

e x p an d \frac{( x + 1 ) ^{10}}{( 4 x - 8 ) ^{11}}

e x p an d \frac{( s + 1 )}{( s + 2 ) ^{3} ( s + 3 )}