问题
解答题
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答案
(1)4+
x=22,2 5
4+
x-4=22-4,2 5
x×2 5
=18×5 2
,5 2
x=45;
(2)x-0.2x=48,
0.8x=48,
0.8x÷0.8=48÷0.8,
x=60;
(3)
x-5=18,1 3
x-5+5=18+5,1 3
x×3=23×3,1 3
x=69;
(4)
x+2 3
x=84,1 2
x=84,7 6
x×7 6
=84×6 7
,6 7
x=72;
(5)20%x=2,
0.2x÷0.2=2÷0.2,
x=10;
(6)20%x=16,
0.2x÷0.2=16÷0.2,
x=80;
(7)x-60%x=2,
0.4x=2,
0.4x÷0.4=2÷0.4,
x=5;
(8)100+50%x=450,
100+0.5x-100=450-100,
0.5x÷0.5=350÷0.5,
x=700;
(9)x-
x=24,1 4
x=24,3 4
x×3 4
=24×4 3
,4 3
x=32.