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求未知数x的值.x%0.8x%6=16 2:5=x:10 ...

(1)X-0.8x+6=28, (1-0.8)X+6-6=28-6, 0.2X=22, 0.2X÷0.2=22÷0.2, X=110;(2)(3+x)×0.4=30×0.8, 1.2+0.4x=24, 1.2+0.4x-1.2=24-1.2, 0.4x=22.8, 0.4x÷04=22.8÷0.4, x=57;(3)49:X=3.2:9, 3.2X=49×9, 3.2X=4, 3.2X÷3.2=4÷...

(1)x+ 1 2 x= 4 5 , (1+ 1 2 )x= 4 5 , 3 2 x= 4 5 , 3 2 x× 2 3 = 4 5 × 2 3 , x= 8 15 ;(2)9(x-1)=3(x+8), 9x-9=3x+24, 9x-9+9=3x+24+9, 9x=3x+33,9x-3x=3x+33-3x, 6x=33, 6x÷6=33÷6, x= 11 2 ;(3)0.372:0.744= 1 ...

(1)5.02-1.37-2.63;=5.02-(1.37+2.63),=5.02-4,=1.02;(2 )125×(56+12)+0.8,=125×56+125×12+0.8,=2+1.2+0.8,=2+(1.2+0.8),=2+2,=4;(3)15:x=0.32:4.8, 0.32x=0.2×4.8, 0.32x=0.96,0.32x÷0.32=0.96÷0.32, x=3;(4)1....

(1)x+3x=56, 4x=56, 4x÷=56÷4, x=14;(2)4x-0.8x=22.4, 3.2x=22.4, 3.2x÷3.2=22.4÷3.2, x=7;(3)3.6x+8x=34.8, 11.6x=34.8,11.6x÷11.6=34.8÷11.6,x=3.

你好: 0.16:2/5=8/25:x 0.16x=2/5*8/25 x=4/5 愿对你有帮助!

①x-35x=165, (1-35)x=165, 25x=165, 25x×52=165×52, x=8;②36-23x=18,36-23x+23x=18+23x, 18+23x=36, 18+23x-18=36-18, 23x=18; 23x×32=18×32; x=27;③x:6=1.2:0.8, 0.8x=6×1.2, 0.8x=7.2,0.8x÷0.8=7.2÷0.8, x=9.

(1)0.75X+3×0.8=7.5, 0.75x+2.4=7.5, 0.75x+2.4-2.4=7.5-2.4, 0.75x÷0.75=5.1÷0.75, x=6.8;(2)12X+23X=56, 76x=56, 76x÷76=56÷76, x=57;(3)X-4=3X-12, X-4+12=3X-12+12, x+8-x=3x-x, 8÷2=2x÷2, x=4.

(1) 10 x = 2.5 0.8 ,2.5x=10×0.8, 2.5x÷2.5=8÷2.5, x=3.2;(2)6×3-1.8X=7.2, 18-1.8X=7.2, 18-1.8X+1.8X=7.2+1.8X, 7.2+1.8X=18,7.2+1.8X-7.2=18-7.2,1.8X=10.8,1.8X÷1.8=10.8÷1.8, X=6.

X:0.8=7/10, X=7/10×4/5, X=14/25。

1.8/x=7.2/0.8 7.2x=1.8*0.8 x=1/5

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