题目内容
求未知数x的值.
| x-40%x=12 | x:8=0.125:0.25 |
| 1+20%x=12. |
(1)x-40%x=12,
0.6x=12,
0.6x÷0.6=12÷0.6,
x=20;
(2)x:8=0.125:0.25,
0.25x=0.125×8,
0.25x÷0.25=1÷0.25,
x=4;
(3)
=
,
2x=1.8×5,
2x÷2=9÷2,
x=4.5;
(4)1+20%x=12.
1+20%x-1=12-1,
20%x=11,
20%x÷20%=11÷20%,
x=55.
0.6x=12,
0.6x÷0.6=12÷0.6,
x=20;
(2)x:8=0.125:0.25,
0.25x=0.125×8,
0.25x÷0.25=1÷0.25,
x=4;
(3)
| 1.8 |
| x |
| 2 |
| 5 |
2x=1.8×5,
2x÷2=9÷2,
x=4.5;
(4)1+20%x=12.
1+20%x-1=12-1,
20%x=11,
20%x÷20%=11÷20%,
x=55.
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