题目内容
| 求未知数X. X+36=128 | 16.9÷X=0.13 | 12-X=1.75 | X×0.7=10.5. |
(1)X+36=128,
X+36-36=128-36,
X=92;
(2)16.9÷X=0.13,
16.9÷X×X=0.13×X,
0.13X=16.9,
0.13X÷0.13=16.9÷0.13,
X=130;
(3)12-X=1.75,
12-X+X=1.75+X,
1.75+X=12,
1.75+X-1.75=12-1.75,
X=10.25;
(4)X×0.7=10.5,
X×0.7÷0.7=10.5÷0.7,
X=15.
X+36-36=128-36,
X=92;
(2)16.9÷X=0.13,
16.9÷X×X=0.13×X,
0.13X=16.9,
0.13X÷0.13=16.9÷0.13,
X=130;
(3)12-X=1.75,
12-X+X=1.75+X,
1.75+X=12,
1.75+X-1.75=12-1.75,
X=10.25;
(4)X×0.7=10.5,
X×0.7÷0.7=10.5÷0.7,
X=15.
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