问题
解答题
巧解“密码”. ①48-3x=18 ②
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答案
①48-3x=18,
48-3x+3x=18+3x,
3x+18=48,
3x+18-18=48-18,
3x=30,
3x÷3=30÷3,
x=10;
②
X+1 2
X=1 3
,5 7
X=5 6
,5 7
X÷5 6
=5 6
÷5 7
,5 6
X=
.6 7
巧解“密码”. ①48-3x=18 ②
|
①48-3x=18,
48-3x+3x=18+3x,
3x+18=48,
3x+18-18=48-18,
3x=30,
3x÷3=30÷3,
x=10;
②
X+1 2
X=1 3
,5 7
X=5 6
,5 7
X÷5 6
=5 6
÷5 7
,5 6
X=
.6 7