问题
解答题
解方程: (1)x÷
(2)
(3)12x+7×0.3=14.7. |
答案
(1)x÷
=3 5
,3 10
x÷
×3 5
=3 5
×3 10 3 5
x=
;9 50
(2)
x+1 2
x=2 3
,5 6
x=7 6
,5 6
x×7 6
=6 7
×5 6
,6 7
x=
;5 7
(3)12x+7×0.3=14.7,
12x+2.1=14.7,
12x+2.1-2.1=14.7-2.1,
12x=12.6,
12x÷12=12.6÷12,
x=1.05.