题目内容
| 解方程. 2X+3×0.9=24.7 | 40%X=48×
| 3.2=0.5X | ||||||||
| 7.8X+15=105 |
| 5%X+
|
(1)2X+3×0.9=24.7,
2X+2.7=24.7,
2X+2.7-2.7=24.7-2.7,
2X=22,
2X÷2=22÷2,
X=11;
(2)40%X=48×
,
40%X÷40%=48×
÷40%,
X=100;
(3)3.2=0.5X,
0.5X÷0.5=3.2÷0.5,
X=6.4;
(4)7.8X+15=105,
7.8X+15-15=105-15,
7.8X=90,
7.8X÷7.8=90÷7.8,
X=
;
(5)
X×
=
,
X×
÷
=
÷
,
X=
÷
,
X÷
=
÷
÷
,
X=
;
(6)5%X+
X=16,
0.8X=16,
0.8X÷0.8=16÷0.8,
X=20.
2X+2.7=24.7,
2X+2.7-2.7=24.7-2.7,
2X=22,
2X÷2=22÷2,
X=11;
(2)40%X=48×
| 5 |
| 6 |
40%X÷40%=48×
| 5 |
| 6 |
X=100;
(3)3.2=0.5X,
0.5X÷0.5=3.2÷0.5,
X=6.4;
(4)7.8X+15=105,
7.8X+15-15=105-15,
7.8X=90,
7.8X÷7.8=90÷7.8,
X=
| 150 |
| 13 |
(5)
| 1 |
| 4 |
| 2 |
| 3 |
| 5 |
| 7 |
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 4 |
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 4 |
X=
| 30 |
| 7 |
(6)5%X+
| 3 |
| 4 |
0.8X=16,
0.8X÷0.8=16÷0.8,
X=20.
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