(2Đ) A) 3X – 18 = 12 3X = 12 + 18 = 30 ( 0,5Đ )...

bài 4: - KIEM TRA HK1 TOAN 6 CO DAP AN
Toán KIEM TRA HK1 TOAN 6 CO DAP AN

Bài 4: (2đ) a) 3x – 18 = 12

3x = 12 + 18 = 30 ( 0,5đ )

x = 30 : 3 = 10 ( 0,5đ )

b) ( 2x – 8 ) . 2 = 2

4

.

2x – 8 = 2

4

: 2 = 8 ( 0,5đ )

2x = 8 + 8 = 16 ( 0,25đ )

x =16 : 2 = 8 ( 0,25đ )