求未知数x147÷5x=9.8 160×25%-1.3x=17.9 2/3x+1/4x=3.3 0.8×(x-0.2)=
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147÷5x=9.8

5x=147÷9.8

x=15÷5

x=3

160×25%-1.3x=17.9

40-1.3x=17.9

1.3x=40-17.9

x=22.1÷1.3

x=17

2/3x+1/4x=3.3

(2/3+1/4)x=3.3

11/12x=3.3

x=3.3÷11/12

x=3.6

0.8×(x-0.2)=1

0.8x-0.16=1

0.8x=1+0.16

x=1.16÷0.8

x=1.45

2%x×15+1/2=11

0.3x+0.5=11

0.3x=11-0.5

x=10.5÷0.3

x=3.5

5/x-6/x=0.4

(5-6)/x=0.4

-1/x=0.4

0.4x=-1

x=-1÷0.4

x=-2.5

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