Question

【题目】解方程．

（x﹣3）÷2=7.5

x﹣0.36x=32.8

5x﹣61=38.5

2（x+1.7）=4.8．

Answer 1

【答案】

【解析】解：①（x﹣3）÷2=7.5

（x﹣3）÷2×2=7.5×2

x﹣3=15

x﹣3+3=15+3

x=18

②x﹣0.36x=32.8

0.64x=32.8

0.64x÷0.64=32.8÷0.64

x=51.25

③5x﹣61=38.5

5x﹣61+61=38.5+61

5x=99.5

5x÷5=99.5÷5

x=19.9

④2（x+1.7）=4.8

2（x+1.7）÷2=4.8÷2

x+1.7=2.4

x+1.7﹣1.7=2.4﹣1.7

x=0.7