题目内容
巧解“密码”.
①48-3x=18
②
X+
X=
.
①48-3x=18
②
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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
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X=
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