题目内容
解方程.
①
x+2.5×8=95
②1.25x-x=100
③40%x+5.4=70
④
x+
x=19.
①
| 2 |
| 5 |
②1.25x-x=100
③40%x+5.4=70
④
| 2 |
| 3 |
| 3 |
| 5 |
①
x+2.5×8=95,
x+20=95,
x=95-20,
x=75×
,
x=187.5;
②1.25x-x=100,
0.25x=100,
x=100÷0.25,
x=400;
③40%x+5.4=70,
0.4x=70-5.4,
x=64.6÷0.4,
x=161.5;
④
x+
x=19,
x+
x=19,
x=19,
x=19×
,
x=15.
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
x=75×
| 5 |
| 2 |
x=187.5;
②1.25x-x=100,
0.25x=100,
x=100÷0.25,
x=400;
③40%x+5.4=70,
0.4x=70-5.4,
x=64.6÷0.4,
x=161.5;
④
| 2 |
| 3 |
| 3 |
| 5 |
| 10 |
| 15 |
| 9 |
| 15 |
| 19 |
| 15 |
x=19×
| 15 |
| 19 |
x=15.
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