问题
解答题
求未知数x. 7x+5×0.7=8.4
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答案
(1)7x+5×0.7=8.4,
7x+3.5=8.4,
7x+3.5-3.5=8.4-3.5,
7x÷7=4.9÷7,
x=0.7;
(2)
:36%=3 5
:x,4 5
x=36%×3 5
,4 5
x×3 5
=0.288×5 3
,5 3
x=0.48.
求未知数x. 7x+5×0.7=8.4
|
(1)7x+5×0.7=8.4,
7x+3.5=8.4,
7x+3.5-3.5=8.4-3.5,
7x÷7=4.9÷7,
x=0.7;
(2)
:36%=3 5
:x,4 5
x=36%×3 5
,4 5
x×3 5
=0.288×5 3
,5 3
x=0.48.