解方程或比例. ①
②
③X:12=
|
(1)
x-2=0.5,5 48
x-2+2=0.5+2,5 48
x×5 48
=2.5×48 5
,48 5
x=24;
(2)
=x 8.1
,4 10.8
10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;
(3)x:12=
:2.8,7 4
2.8x=12×
,7 4
2.8x÷2.8=21÷2.8,
x=7.5.
解方程或比例. ①
②
③X:12=
|
(1)
x-2=0.5,5 48
x-2+2=0.5+2,5 48
x×5 48
=2.5×48 5
,48 5
x=24;
(2)
=x 8.1
,4 10.8
10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;
(3)x:12=
:2.8,7 4
2.8x=12×
,7 4
2.8x÷2.8=21÷2.8,
x=7.5.