题目内容
解方程:
①
x=16×
;
②x-15%x=37.4;
③19-1.2x=7.
①
| 3 |
| 4 |
| 5 |
| 32 |
②x-15%x=37.4;
③19-1.2x=7.
①
x=16×
,
x=
,
x×
=
×
,
x=
;
②x-15%x=37.4,
(1-15%)x=37.4,
85%x=37.4,
0.85x=37.4,
0.85x÷0.85=37.4÷0.85,
x=44;
③19-1.2x=7,
19-1.2x+1.2x=7+1.2x,
7+1.2x=19,
7+1.2x-7=19-7,
1.2x=12,
1.2x÷1.2=12÷1.2,
x=10.
| 3 |
| 4 |
| 5 |
| 32 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
| 4 |
| 4 |
| 3 |
| 5 |
| 2 |
| 4 |
| 3 |
x=
| 10 |
| 3 |
②x-15%x=37.4,
(1-15%)x=37.4,
85%x=37.4,
0.85x=37.4,
0.85x÷0.85=37.4÷0.85,
x=44;
③19-1.2x=7,
19-1.2x+1.2x=7+1.2x,
7+1.2x=19,
7+1.2x-7=19-7,
1.2x=12,
1.2x÷1.2=12÷1.2,
x=10.
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