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求未知数X:①0.6÷X=12:5 ...

(1)0.6÷X=12:5, 12x=0.6×5, 12x÷12=3÷12, x=14;(2)10+59X=35×47, 10+59X=20, 10+59X-10=20-10, 59X=10, 59X÷59=10÷59, x=18.

(1)0.6÷X=12:5, 12X=3, X=3÷12, X= 1 4 ;(2)20- 5 9 X=35× 2 7 20- 5 9 X=10, 5 9 x=20- 10, x=10× 9 5 , x=18.

(1)1.5x-0.6×15=18, 1.5x-9=18, 1.5x-9+9=18+9, 1.5x÷1.5=27÷1.5, x=18;(2) 3 4 :x=3:12, 3x= 3 4 ×12,3x÷3=9÷3, x=3;(3) 1 2 x+ 2 3 x=42, 7 6 x=42, 7 6 x× 6 7 =42× 6 7 , x=36.

①0.8×34-3x=0.2, 0.6-3x=0.2, 0.6-3x+3x=0.2+3x, 0.6=0.2+3x, 0.6-0.2=0.2+3x-0.2, 0.4=3x, 0.4÷3=3x÷3, 215=x, x=215;②312:0.4=x:117. 0.4x=312×117, 0.4x=72×87, 0.4x=4, 0.4x÷0.4=4÷0.4, x=10;

①1-34x=0.6 1+34x-34x=0.6+34x 1=0.6+34x0.6-0.6+34x=1-0.6 34x=25 34x×43=25×43 x=815②23x+0.5x=42 46x+36x=42 76x=42 76x×67=42×67 x=36③8.6:7=x:1.4 7x=8.6×1.4 7x÷7=8.6×1.4÷7 x=1.72

(1)6(x-0.5)=30, 6(x-0.5)÷6=30÷6, x-0.5=5, x-0.5+0.5=5+0.5, x=5.5;检验:把x=5.5代入原方程,左边=6×(5.5-0.5)=30,右边=30,左边=右边,所以,x=5.5是原方程的解;(2) 1.2 7.5 = 0.4 x , 1.2x=0.4×7.5, 1.2x=3,1.2x÷1.2=...

(1)X-0.8X-6=16, 0.2X-6=16, 0.2X-6+6=16+6, 0.2X÷0.2=22÷0.2, X=110;(2)15:29=27:(10+X), 15×(10+X)=29×27,15×(10+X)×5=6×5, 10+X-10=30-10, X=20;(3)23x+13=45, 23x+13?13=45?13, 23x×32=715×32, x=710.

(1)16+5%x=24 16+0.05x=2416+0.05x-16=24-16 0.05x=80.05x÷0.05=8÷0.05x=160;(2)x-0.4x=0.72 0.6x=0.720.6x÷0.6=0.72÷0.6 x=1.2;(3)x: 2 7 =14: 2 5 2 5 x=14× 2 7 x=4÷ 2 5 x=10.

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(1)4X+0.8×6=15.2, 4X+4.8=15.2, 4X+4.8-4.8=15.2-4.8, 4X=10.4, 4X÷4=10.4÷4, X=2.6;(2)X-13X=56, (1-13)X=56, 23X=56, 23X×32=56×32, X=54;(3)X:34=2:910, 910X=34×2, 910X×109=32×109, X=53.

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