题目内容
解方程.
(1)X:5.6=
(2)8X+
X=66(3)20%X-1.8×4=0.8.
(1)X:5.6=
| 1 |
| 8 |
| 1 |
| 4 |
(1)X:5.6=
,
8X=5.6×1,
8X÷8=5.6÷8,
X=0.7;
(2)8X+
X=66,
X=66,
X×
=66×
,
X=8;
(3)20%X-1.8×4=0.8,
0.2X-7.2=0.8,
0.2X-7.2+7.2=0.8+7.2,
0.2X÷0.2=8÷0.2,
X=40.
| 1 |
| 8 |
8X=5.6×1,
8X÷8=5.6÷8,
X=0.7;
(2)8X+
| 1 |
| 4 |
| 33 |
| 4 |
| 33 |
| 4 |
| 4 |
| 33 |
| 4 |
| 33 |
X=8;
(3)20%X-1.8×4=0.8,
0.2X-7.2=0.8,
0.2X-7.2+7.2=0.8+7.2,
0.2X÷0.2=8÷0.2,
X=40.
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