问题
解答题
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答案
(1)4x-3×5=60,
4x-15+15=60+15,
4x÷4=75÷4,
x=18.75;
(2)x-
x=0.8,1 3
x=0.8,2 3
x÷2 3
=0.8÷2 3
,2 3
x=1.2;
(3)5x-20%x=19.2,
4.8x=19.2,
4.8x÷4.8=19.2÷4.8,
x=4;
(4)x×(
+1 5
)=27,1 4
x=27,9 20
x÷9 20
=27÷9 20
,9 20
x=60.