问题
解答题
求未知数x. 16-40%x=12
16:x=0.75:
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答案
(1)16-40%x=12
16-40%x+40%x=12+40%x
16-12=12+40%x-12
4÷40%=40%÷40%
x=10;
(2)
x+5 9
x=1.61 3
x=1.68 9
x÷8 9
=1.6÷8 9 8 9
x=1.8;
(3)16:x=0.75:15 8
0.75x=16×15 8
0.75x÷0.75=30÷0.75
x=40.