问题
解答题
求未知数. (1)
(2)
(3)4x+3×0.7=6.5. |
答案
(1)
x+1 3
x=2 5 4 15
x×11 15
=15 11
×4 15
,15 11
x=
;4 11
(2)
=0.25 x 1.25 3
1.25x=0.25×3,
1.25x÷1.25=0.25×3÷1.25,
x=0.6;
(3)4x+3×0.7=6.5
4x+2.1=6.5,
4x+2.1-2.1=6.5-2.1,
4x÷4=4.4÷4,
x=1.1.