问题
解答题
解下列方程. (1)9×6+x=76.8 (2)(1-45%)x=110 (3)
(4)5.6x+12.88=42. |
答案
(1)9×6+x=76.8
54+x=76.8
54+x-54=76.8-54
x=22.8
(2)(1-45%)x=110
0.55x=110
0.55x÷0.55=110÷0.55
x=200
(3)
÷x=6 5
×7 4 2 3
÷x×x=6 5
×x7 6
x=7 6 6 5
x×7 6
=6 7
×6 5 6 7
x=36 35
(4)5.6x+12.88=42
5.6x+12.88-12.88=42-12.88
5.6x=29.12
5.6x÷5.6=29.12÷5.6
x=5.2