问题
解答题
解方程.
3.5x=42
x-7=1.2
6x=72
x÷0.7=4.
答案
(1)3.5x=42
3.5x÷3.5=42÷3.5
x=12;
(2)x-7=1.2
x-7+7=1.2+7
x=8.2;
(3)6x=72
6x÷6=72÷6
x=12;
(4)x÷0.7=4
x÷0.7×0.7=4×0.7
x=2.8.
解方程.
3.5x=42
x-7=1.2
6x=72
x÷0.7=4.
(1)3.5x=42
3.5x÷3.5=42÷3.5
x=12;
(2)x-7=1.2
x-7+7=1.2+7
x=8.2;
(3)6x=72
6x÷6=72÷6
x=12;
(4)x÷0.7=4
x÷0.7×0.7=4×0.7
x=2.8.