求X.6+[0.5×45+(235−X)×9]÷4=22
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求X.6+[0.5×
+(2
−X)×9]÷4=22
4 |
5 |
3 |
5 |
6+[0.5×
4
5+(2
3
5-x)×9]÷4=22,
6+[0.5×0.8+(2
3
5-x)×9]÷4-6=22-6,
[0.5×0.8+(2
3
5-x)×9]÷4=16,
[0.4+(2
3
5-x)×9]÷4×4=16×4,
0.4+(2
3
5-x)×9=64,
0.4+(2
3
5-x)×9-0.4=64-0.4,
(2
3
5-x)×9=63.6,
(2
3
5-x)×9÷9=63.6÷9,
2
3
5-x=
106
15,
2
3
5-x+x=
106
15+x,
106
15+x=2
3
5,
106
15+x-
106
15=2
3
5-
106
15,
x=-4
7
15.
4
5+(2
3
5-x)×9]÷4=22,
6+[0.5×0.8+(2
3
5-x)×9]÷4-6=22-6,
[0.5×0.8+(2
3
5-x)×9]÷4=16,
[0.4+(2
3
5-x)×9]÷4×4=16×4,
0.4+(2
3
5-x)×9=64,
0.4+(2
3
5-x)×9-0.4=64-0.4,
(2
3
5-x)×9=63.6,
(2
3
5-x)×9÷9=63.6÷9,
2
3
5-x=
106
15,
2
3
5-x+x=
106
15+x,
106
15+x=2
3
5,
106
15+x-
106
15=2
3
5-
106
15,
x=-4
7
15.
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