X-5X%=17.5
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X-5X%=17.5
7X+5×0.7=8
3X÷5=48
40-X=3.
7X+5×0.7=8
3X÷5=48
40-X=3.
(1)X-5X%=17.5,
(1-0.05)X=17.5,
0.95X=17.5,
0.95X÷0.95=17.5÷0.95,
X=
350
19;
(2)7X+5×0.7=8,
7X+3.5=8,
7X+3.5-3.5=8-3.5,
7X=4.5,
7X÷7=4.5÷7,
X=
9
14;
(3)3X÷5=48,
3X÷5×5=48×5,
3X=240,
3X÷3=240÷3,
X=80;
(4)40-X=3,
40-X+X=3+X,
3+X=40,
3+X-3=40-3,
X=37.
(1-0.05)X=17.5,
0.95X=17.5,
0.95X÷0.95=17.5÷0.95,
X=
350
19;
(2)7X+5×0.7=8,
7X+3.5=8,
7X+3.5-3.5=8-3.5,
7X=4.5,
7X÷7=4.5÷7,
X=
9
14;
(3)3X÷5=48,
3X÷5×5=48×5,
3X=240,
3X÷3=240÷3,
X=80;
(4)40-X=3,
40-X+X=3+X,
3+X=40,
3+X-3=40-3,
X=37.