题目内容
| 16×8-5x=23 | 2.5x÷20=16 |
| 6.2x-x=41.6 | x÷0.5=48.6×2. |
(1)16×8-5x=23
128-5x+5x=23+5x
23+5x-23=128-23
5x÷5=105÷5
x=21;
(2)2.5x÷20=16
2.5x÷20×20=16×20
2.5x÷2.5=320÷2.5
x=128;
(3)6.2x-x=41.6
5.2x=41.6
5.2x÷5.2=41.6÷5.2
x=8;
(4)x÷0.5=48.6×2
x÷0.5=97.2
x÷0.5×0.5=97.2×0.5
x=48.6.
128-5x+5x=23+5x
23+5x-23=128-23
5x÷5=105÷5
x=21;
(2)2.5x÷20=16
2.5x÷20×20=16×20
2.5x÷2.5=320÷2.5
x=128;
(3)6.2x-x=41.6
5.2x=41.6
5.2x÷5.2=41.6÷5.2
x=8;
(4)x÷0.5=48.6×2
x÷0.5=97.2
x÷0.5×0.5=97.2×0.5
x=48.6.
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