求未知数x.(1)3.6×0.5-0.75x=0.8 (2)...
求未知数x.(1)3.6×0.5-0.75x=0.8(2)23:56=x:9(3)16(2.4x+6)=2.5....
求未知数x.(1)3.6×0.5-0.75x=0.8 (2)23:56=x:9 (3)16(2.4x+6)=2.5.
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(1)3.6×0.5-0.75x=0.8
1.8-0.75x=0.8
1.8-0.75x+0.75x=0.8+0.75x
1.8-0.8=0.75x
1÷0.75=0.75x÷0.75
x=
;
(2)
:
=x:9
x=6
x÷
=6÷
x=
;
(3)
(2.4x+6)=2.5
0.4x+1=2.5
0.4x+1-1=2.5-1
0.4x=1.5
0.4x÷0.4=1.5÷0.4
x=3.75.
1.8-0.75x=0.8
1.8-0.75x+0.75x=0.8+0.75x
1.8-0.8=0.75x
1÷0.75=0.75x÷0.75
x=
4 |
3 |
(2)
2 |
3 |
5 |
6 |
5 |
6 |
5 |
6 |
5 |
6 |
5 |
6 |
x=
36 |
5 |
(3)
1 |
6 |
0.4x+1=2.5
0.4x+1-1=2.5-1
0.4x=1.5
0.4x÷0.4=1.5÷0.4
x=3.75.
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