求未知数x.(1)5x-20%x=19.2 (2)0.8:3...
求未知数x.(1)5x-20%x=19.2(2)0.8:334=(5-x):0.75....
求未知数x.(1)5x-20%x=19.2 (2)0.8:334=(5-x):0.75.
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飒飒MZm6
推荐于2016-03-05
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(1)5x-20%x=19.2,
4.8x=19.2,
4.8x÷4.8=19.2÷4.8,
x=4;
(2)0.8:3
=(5-x):0.75,
3
(5-x)=0.8×0.75,
3
(5-x)÷3
=0.6÷3
,
5-x=0.16,
5-x+x=0.16+x,
0.16+x-0.16=5-0.16,
x=4.84.
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