求未知数x的值:(1)1.3x+0.9x-3=0.3 &nb...
求未知数x的值:(1)1.3x+0.9x-3=0.3(2)113x÷45=1013(3)0.751.5=x8(4)0.6:3.6=45:x....
求未知数x的值:(1)1.3x+0.9x-3=0.3 (2)113x÷45=1013(3)0.751.5=x8(4)0.6:3.6=45:x.
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(1)1.3x+0.9x-3=0.3,
2.2x-3=0.3,
2.2x-3+3=0.3+3,
2.2x=3.3
2.2x÷2.2=3.3÷2.2,
x=1.5;
(2)
x÷
=
,
x÷
×
=
×
,
x=
,
x÷
=
÷
,
x=8;
(3)
=
,
×8=
×8,
x=
×8,
x=4;
(4)0.6:3.6=
:x,
0.6x=3.6×
,
0.6x=2.88,
0.6x÷0.6=2.88÷0.6,
x=4.8.
2.2x-3=0.3,
2.2x-3+3=0.3+3,
2.2x=3.3
2.2x÷2.2=3.3÷2.2,
x=1.5;
(2)
1 |
13 |
4 |
5 |
10 |
13 |
1 |
13 |
4 |
5 |
4 |
5 |
10 |
13 |
4 |
5 |
1 |
13 |
8 |
13 |
1 |
13 |
1 |
13 |
8 |
13 |
1 |
13 |
x=8;
(3)
0.75 |
1.5 |
x |
8 |
0.75 |
1.5 |
x |
8 |
x=
0.75 |
1.5 |
x=4;
(4)0.6:3.6=
4 |
5 |
0.6x=3.6×
4 |
5 |
0.6x=2.88,
0.6x÷0.6=2.88÷0.6,
x=4.8.
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