题目内容
求X.6+[0.5×
+(2
-X)×9]÷4=22.
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分析:根据等式的性质,两边同减去6,得[0.5×0.8+(2
-x)×9]÷4=16,两边同乘4并化简,得0.4+(2
-x)×9=64,两边同减去0.4,得(2
-x)×9=63.6,两边同除以9,得2
-x=
,两边同加上x,得
+x=2
,两边再减去
即可.
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| 3 |
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| 3 |
| 5 |
| 3 |
| 5 |
| 106 |
| 15 |
| 106 |
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| 106 |
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解答:解:6+[0.5×
+(2
-x)×9]÷4=22,
6+[0.5×0.8+(2
-x)×9]÷4-6=22-6,
[0.5×0.8+(2
-x)×9]÷4=16,
[0.4+(2
-x)×9]÷4×4=16×4,
0.4+(2
-x)×9=64,
0.4+(2
-x)×9-0.4=64-0.4,
(2
-x)×9=63.6,
(2
-x)×9÷9=63.6÷9,
2
-x=
,
2
-x+x=
+x,
+x=2
,
+x-
=2
-
,
x=-4
.
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6+[0.5×0.8+(2
| 3 |
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[0.5×0.8+(2
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[0.4+(2
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0.4+(2
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0.4+(2
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(2
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(2
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2
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| 106 |
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2
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| 106 |
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| 106 |
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| 106 |
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| 106 |
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| 106 |
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x=-4
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点评:此题考查了根据等式的性质解方程,即等式两边同加、同减、同乘或同除以一个数(0除外),等式的左右两边仍相等;注意等号上下要对齐.
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