
求未知数X.(x-1.8)×5=5 ...
求未知数X.(x-1.8)×5=534x-5%x=17.538:x=120:35x5?x6=0.4....
求未知数X.(x-1.8)×5=5 34x-5%x=17.538:x=120:35 x5?x6=0.4.
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(1)(x-1.8)×5=5
(x-1.8)×5÷5=5÷5
x-1.8=1
x-1.8+1.8=1+1.8
x=2.8;
(2)
x-5%x=17.5
0.7x=17.5
0.7x÷0.7=17.5÷0.7
x=25;
(3)
:x=
:
x=
×
x÷
=
÷
x=
;
(4)
?
=0.4
x=0.4
x÷
=0.4÷
x=12.
(x-1.8)×5÷5=5÷5
x-1.8=1
x-1.8+1.8=1+1.8
x=2.8;
(2)
3 |
4 |
0.7x=17.5
0.7x÷0.7=17.5÷0.7
x=25;
(3)
3 |
8 |
1 |
20 |
3 |
5 |
1 |
20 |
3 |
8 |
3 |
5 |
1 |
20 |
1 |
20 |
9 |
40 |
1 |
20 |
x=
9 |
2 |
(4)
x |
5 |
x |
6 |
1 |
30 |
1 |
30 |
1 |
30 |
1 |
30 |
x=12.
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