问题
解答题
求未知数X. ①4×6-0.4X=2.4 ②
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答案
(1)4×6-0.4X=2.4,
24-0.4x+0.4=2.4+0.4x,
24-2.4=2.4+0.4x-2.4,
21.6÷0.4=0.4x÷0.4,
x=54;
(2)
:1 5
=1 20
:X,5 3
x=1 5
×1 20
,5 3
x=1 5
,1 12
x÷1 5
=1 5
÷1 12
,1 5
x=
.5 12