问题
解答题
求未知数χ.(4%) (1)4+0.7χ=102 (2)
|
答案
(1)4+0.7χ=102
4+0.7X-4=102-4,
0.7X=98,
0.7X÷0.7=98÷0.7,
x=140;
(2)
:1 6
=x:3 5 9 5
X=3 5
×1 6
,9 5
X÷3 5
=3 5
×1 6
÷9 5
,3 5
X=
.1 2
求未知数χ.(4%) (1)4+0.7χ=102 (2)
|
(1)4+0.7χ=102
4+0.7X-4=102-4,
0.7X=98,
0.7X÷0.7=98÷0.7,
x=140;
(2)
:1 6
=x:3 5 9 5
X=3 5
×1 6
,9 5
X÷3 5
=3 5
×1 6
÷9 5
,3 5
X=
.1 2