问题
解答题
解方程或比例. ①
②
③0.5x-4×0.25=1.25. |
答案
(1)
x+1 4
x=1 2 5 8
x=3 4
,5 8
x×3 4
=4 3
×5 8
,4 3
x=
;5 6
(2)
=2x 0.6
,0.9 3
2×3x=0.6×0.9,
6x=0.54,
6x÷6=0.54÷6,
x=0.09;
(3)0.5x-4×0.25=1.25,
0.5x-1=1.25,
0.5x-1+1=1.25+1,
0.5x÷0.5=2.25÷0.5,
x=4.5.