问题
解答题
解方程:
4+0.7x=102;
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答案
(1)
=30%,x 4
×4=0.3×4,x 4
x=1.2;
(2)4+0.7x=102,
4+0.7x-4=102-4,
0.7x=98,
0.7x÷0.7=98÷0.7,
x=140;
(3)
x+2 3
x=42,1 2
x=42,7 6
x÷7 6
=42÷7 6
,7 6
x=36.
解方程:
4+0.7x=102;
|
(1)
=30%,x 4
×4=0.3×4,x 4
x=1.2;
(2)4+0.7x=102,
4+0.7x-4=102-4,
0.7x=98,
0.7x÷0.7=98÷0.7,
x=140;
(3)
x+2 3
x=42,1 2
x=42,7 6
x÷7 6
=42÷7 6
,7 6
x=36.