Question

解方程 3x-1.2x=9 8.8-4.4x=4.4 2.25X4+0.3x=12 13x+5X13=169

Answer 1

3x-1.2x=9

1.8x=9

x=5

8.8-4.4x=4.4

4.4x=4.4

x=1

2.25X4+0.3x=12

9+0.3x=12

0.3x=3

x=10

13x+5X13=169

13x+65=169

13x=104

x=8