问题
解答题
解方程. (1)3x+3×6
(2)7x-3
|
答案
(1)3x+3×6
=31.2,1 2
3x+19.5=31.2,
3x+19.5-19.5=31.2-19.5,
3x=11.7,
3x÷3=11.7÷3,
x=3.9;
(2)7x-3
x=0.72,2 5
(7-3.4)x=0.72,
3.6x=0.72,
3.6x÷3.6=0.72÷3.6,
x=0.2.
解方程. (1)3x+3×6
(2)7x-3
|
(1)3x+3×6
=31.2,1 2
3x+19.5=31.2,
3x+19.5-19.5=31.2-19.5,
3x=11.7,
3x÷3=11.7÷3,
x=3.9;
(2)7x-3
x=0.72,2 5
(7-3.4)x=0.72,
3.6x=0.72,
3.6x÷3.6=0.72÷3.6,
x=0.2.