
解方程或解比例.4x+3×0.9=24.7 &n...
解方程或解比例.4x+3×0.9=24.7(1-40%)x=1223:x=47:61.62.5=40x...
解方程或解比例.4x+3×0.9=24.7 (1-40%)x=12 23:x=47:6 1.62.5=40x
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①4x+3×0.9=24.7
4x+2.7=24.7
4x+2.7-2.7=24.7-2.7
4x=22
4x÷4=22÷4
x=5.5
②(1-40%)x=12
0.6x=12
0.6x÷0.6=12÷0.6
x=20
③
:x=
:6
x=
×6
x×
=4×
x=7
④
=
1.6x=2.5×40
x=100
x×
=100×
x=62.5
4x+2.7=24.7
4x+2.7-2.7=24.7-2.7
4x=22
4x÷4=22÷4
x=5.5
②(1-40%)x=12
0.6x=12
0.6x÷0.6=12÷0.6
x=20
③
2 |
3 |
4 |
7 |
4 |
7 |
2 |
3 |
4 |
7 |
7 |
4 |
7 |
4 |
x=7
1.6 |
2.5 |
40 |
x |
1.6x=2.5×40
8 |
5 |
8 |
5 |
5 |
8 |
5 |
8 |
x=62.5
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