展开 (5x+4y=2,)(3x+3y=-3)

解答

展开

(5 x + 4 y = 2,) (3 x + 3 y = - 3)

5 \cdot 3 xx + 5 \cdot 3 x y = - 5 \cdot 3 x + 4 y = 2, 3 x + 4 y = 2, 3 y = - 4 y = 2, 3

求解步骤

(5 x + 4 y = 2,) (3 x + 3 y = - 3)

= (5 x + 4 \cdot 2 =, y) (3 x + 3 = y - 3)

打开括号

5 x \cdot 3 x + 5 x \cdot 3 y = 5 x (- 3) + 4 y = 2, 3 x + 4 y = 2, 3 y = 4 y = 2, (- 3)

使用加减运算法则

+ (- a) = - a

5 \cdot 3 xx + 5 \cdot 3 x y = - 5 \cdot 3 x + 4 y = 2, 3 x + 4 y = 2, 3 y = - 4 y = 2, 3

e x p an d \frac{7 x}{( x - 7 ) ^{2}}

e x p an d y + (32 - 2) x

e x p an d - 2 (- 4 x^{2} + 6 x + 5)^{3}

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

e x p an d 3 (lo g_{3} (x) + lo g_{x} (3) = 10)