Question

解方程5x-2×1.8=3.6；0.5（x+1.2）=2.5．

Answer 1

（1）5x-2×1.8=3.6

5x-3.6=3.6

5x-3.6+3.6=3.6+3.6

5x=7.2

x=1.44；

（2）0.5（x+1.2）=2.5

0.5×x+0.5×1.2=2.5

0.5x+0.6=2.5

0.5x+0.6-0.6=2.5-0.6

0.5x=1.9

x=3.8．