题目内容
求未知数.
①3.5X-4.2×5=21
②2.5:x=2:2
③
×(x+0.5)=25%
①3.5X-4.2×5=21
②2.5:x=2:2
2 |
5 |
③
1 |
8 |
①3.5X-4.2×5=21,
3.5X-21+21=21+21,
3.5x÷3.5=42÷3.5,
x=12;
②2.5:x=2:2
,
2x=2.5×2
,
2x÷2=6÷2,
x=3;
③
×(x+0.5)=25%,
×(x+0.5)÷
=25%÷
,
x+0.5=2,
x+0.5-0.5=2-0.5,
x=1.5.
3.5X-21+21=21+21,
3.5x÷3.5=42÷3.5,
x=12;
②2.5:x=2:2
2 |
5 |
2x=2.5×2
2 |
5 |
2x÷2=6÷2,
x=3;
③
1 |
8 |
1 |
8 |
1 |
8 |
1 |
8 |
x+0.5=2,
x+0.5-0.5=2-0.5,
x=1.5.
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