2(X+5) – X2 – 5X = 0B

bài 3 - KIEM TRA HKI TOAN 8 CO DAP AN
Lớp 8 KIEM TRA HKI TOAN 8 CO DAP AN

Bài 3 ( 1đ) : Tìm x biết : a. 2(x+5) – x

2

– 5x = 0

b. 2x

2

+3x - 5 = 0

2

1 1 2 1x x x x    . :  

2

2

1 1 1 2 1x x x x x    