问题
解答题
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答案
(1)lOx=30,
lOx÷10=30÷10,
x=3;
(2)5x-2.4×5=23,
5x-12=23,
5x-12+12=23+12,
5x÷5=35÷5,
x=7;
(3)
x+5 6
x=16,1 2
x=16,8 6
x×8 6
=16×6 8
,6 8
x=12.
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(1)lOx=30,
lOx÷10=30÷10,
x=3;
(2)5x-2.4×5=23,
5x-12=23,
5x-12+12=23+12,
5x÷5=35÷5,
x=7;
(3)
x+5 6
x=16,1 2
x=16,8 6
x×8 6
=16×6 8
,6 8
x=12.