问题
解答题
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答案
(1)12X-9X=8.7,
3X=8.7,
3x÷3=8.7÷3,
x=2.9;
(2)6X+18=48,
6X+18-18=48-18,
6x=30,
6x÷6=30÷6,
x=5;
(3)X+4.8=7.2,
X+4.8-4.8=7.2-4.8,
x=2.4;
(4)16÷X=2.5,
16÷x×x=2.5x,
16=2.5x,
16÷2.5=2.5x÷2.5,
x=6.4.
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(1)12X-9X=8.7,
3X=8.7,
3x÷3=8.7÷3,
x=2.9;
(2)6X+18=48,
6X+18-18=48-18,
6x=30,
6x÷6=30÷6,
x=5;
(3)X+4.8=7.2,
X+4.8-4.8=7.2-4.8,
x=2.4;
(4)16÷X=2.5,
16÷x×x=2.5x,
16=2.5x,
16÷2.5=2.5x÷2.5,
x=6.4.