# Toán Lớp 8: a, x ²-x=0 b, 5x ²+30x=0 c, 2x ²=8x d, 9x ²-4=0 e, 16=25x ² g,3x(x+1)+(x+1)(x-3)=0 h, (x-2)(3x-5)-(x-2)(x+1)=0

Toán Lớp 8: a, x ²-x=0
b, 5x ²+30x=0
c, 2x ²=8x
d, 9x ²-4=0
e, 16=25x ²
g,3x(x+1)+(x+1)(x-3)=0
h, (x-2)(3x-5)-(x-2)(x+1)=0

### 9 bình luận về “Toán Lớp 8: a, x ²-x=0 b, 5x ²+30x=0 c, 2x ²=8x d, 9x ²-4=0 e, 16=25x ² g,3x(x+1)+(x+1)(x-3)=0 h, (x-2)(3x-5)-(x-2)(x+1)=0”

1. Giải đáp:

Lời giải và giải thích chi tiết:
a, x(x-1)-0
x=0, x=1
b, x(5x+30)=0
x=0, x=-6
c, 2x^2-8x=0
2x(x-4)=0
x=0, x=4
d, (3x-2)(3x+2)=0
x=-3/2, x=3/2
e, x^2=16/25
x=4/5, x=-4/5
g, (x+1)(3x+x-3)=0
x=-1, x=3/4
h, (x-2)(3x-5-x-1)=0
x=2

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