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9Xһ2=5xʮ30

30.5x2.9ʮ30.5x1.1һ30.5 =30.5x2.9+1.1-1 =30.5x3 =91.5

9.6-5x+8x=30 3x=20.4 x=6.8 2(1.2+0.5x)=4x 2.4+x=4x 3x=2.4 x=0.8 1.2(x-5)+1.5=1.62 1.2x-6+1.5=1.62 1.2x=6.12 x=5.1 120+x=7(x-12) 120+x=7x-84 6x=204 x=34

1ȥţ2x-6-3x+15=7x-72x-3x-7x=-7+6-15ϲͬ-8x=-16ϵΪ1x=22ȥţ7x-20x+6=8-4x+67x-20x+4x=8+6-6ϲͬ-9x=8ϵΪ1x=-893ȥĸ3x-5x+12=6+...

12x+71.2=10 2x+8.4=10 2x+8.4-8.4=10-8.4 2x2=1.62 x=0.827-3x=2.5 7-3x+3x=2.5+3x 7-2.5=2.5+3x-2.5 3x3=4.53 x=1.538x-5x=27 3x=27 3x3=273 x=945x=2x+48 5x-2x=2x+48-2x 3x3=483...

3x-30)x4/9=x+30 4/3x-40/3=x+30 1/3x=130/3 x=130 4/5x-30+10=3/4(x-10) 4/5x-20=3/4x-7.5 1/20x=12.5 x=250

11.4(2500%-x)-60%x=15 ⣺1.4(25-x)-0.6x=15 35-1.4x-0.6x=15 2x=20 x=10 29300-x-1.8x=2600 ⣺2700-9x-1.8x=2600 10.8x=100 x=1000/108 x=250/27 35x+1054-x=390 ⣺5x+540-10x=390 5x=150 x=30 418x-318-x=72 ⣺...

1ȥţ10x-10=510x=15ϵΪ1x=1.52ȥĸ47x-1-65x+1=24-33x+2ȥţ28x-4-30x-6=24-9x-628x-30x+9x=24-6+6+4ϲͬ7x=28ϵΪ1x=43ȥţ2y+...

1xʮ2y=9.......(1)3xһ2y=һ1.......(2) (1)+(2)ã4x=8x=2 (1)*3-(2)ã8y=28y=7/2 25xʮ2y=25.......(1)3xʮ4y=15..........(2) (1)*2-(2)ã7x=35x=5 (1)*3-(2)*5ã-14y=0y=0 3...

⣺xʮy=5m xһy=9m x=7m y=-2m 5xʮ7y=935m-14m=9.m=3/7. ׷ʣﵽ㣬ǵòɣO(_)Oлл

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