问题
解答题
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答案
(1)70%x=14,
70%x÷70%=14÷70%,
x=20;
(2)30%x+16=25,
30%x+16-16=25-16,
30%x=9,
30%x÷30%=9÷30%,
x=30;
(3)2x+20%x=44,
2.2x=44,
2.2x÷2.2=44÷2.2,
x=20;
(4)(1-0.375)x=
,5 8
0.625x=
,5 8
0.625x÷0.625=
÷0.625,5 8
x=1;
(5)7+20x=19,
7+20x-7=19-7,
20x=12,
20x÷20=12÷20,
x=0.6;
(6)
x-3 4
x=6,2 5
x=6,7 20
x÷7 20
=6÷7 20
,7 20
x=
.120 7