题目内容
求未知数x.
| 70x-2.3×7=32.9 |
| 5:x=2.5:8. |
(1)70x-2.3×7=32.9,
70x-16.1+16.1=32.9+16.1,
70x÷70=49÷70,
x=0.7;
(2)
=60%,
×12=60%×12,
x=7.2;
(3)5:x=2.5:8,
2.5x=5×8,
2.5x=40÷2.5,
x=16.
70x-16.1+16.1=32.9+16.1,
70x÷70=49÷70,
x=0.7;
(2)
| x |
| 12 |
| x |
| 12 |
x=7.2;
(3)5:x=2.5:8,
2.5x=5×8,
2.5x=40÷2.5,
x=16.
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