10 – 2X + 3X = 25 10 + X = 25 (0,25Đ) X = 25 -10 X = 15 (0,25Đ)

2. - DE THI TOAN HK 1 CO DAP AN
Toán DE THI TOAN HK 1 CO DAP AN

2.

a. x = 10 (0,5đ)

b. 10 – 2x + 3x = 25

10 + x = 25 (0,25đ)

x = 25 -10

x = 15 (0,25đ)