展开 (1.4)(3x+y=5)

解答

展开

(1.4) (3 x + y = 5)

4.2 x + 1.4 y = 5

求解步骤

(1.4) (3 x + y = 5)

= (1.4) (3 x + 5 = y)

使用分配律:

a (b + c) = ab + a c

a = (1.4), b = 3 x, c = y = 5

(1.4) \cdot 3 x + (1.4) y = 5

3 (1.4) x + (1.4) y = 5

乘开

3 (1.4) x + (1.4) y : 4.2 x + 1.4 y

4.2 x + 1.4 y = 5

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

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

s im pl i f y (4 x - 3) (x - 2 + i) (x + 2 - i)

e x p an d 20 + 2 (x - 3 = 8)

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