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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.

①6x+0.5×7=6.5 6x+3.5-3.5=6.5-3.5 6x÷6=3÷6 x=0.5②2.5x=7.5:12 7.5x=2.5×127.5x÷7.5=30÷7.5 x=4③(x-14)×25=1000 (x-14)×25×25=1000÷25 x-14+14=40+14 x=4014④42:35=x:57 35x=42×57 35x÷35=30÷35 x=50.

2×0=0,方程就是: X-0+6=0, X=-6。

(1)x-0.8x-6=16, 0.2x-6=16, 0.2x-6+6=16+6, 0.2x=22, 0.2x÷0.2=22÷0.2, x=110;(2)2:5=x:10, 5x=2×10, 5x=20, 5x÷5=20÷5, x=4;(3)13x+56x=23×14, 76x=23×14, 76x÷76=23×14÷76, x=23×14×67, x=17;(4)x8=1516, 16x=8×...

(1)2.4×1.5+1.2x-0.6=7.2, 3.6+1.2x-0.6=7.2, 1.2x+3=7.2, 1.2x+3-3=7.2-3, 1.2x÷1.2=4.2÷1.2, x=3.5;(2)320:18%=6.5x, 320x=18%×6.5, 320x×203=117100×203, x=745.

(1)5x-0.7×3=6.6, 5x-2.1=6.6, 5x-2.1+2.1=6.6+2.1, 5x=8.7, 5x÷5=8.7÷5, x=1.74;(2) 1 5 :x=5, 5x= 1 5 , 5x÷5= 1 5 ÷5, x= 1 25 ;(3)x÷(1-24%)=1.15, x÷76%=1.15, x÷76%×76%=1.15×76%, x=0.874.

(1)x:34=4:0.5, 0.5x=4×34, 0.5x=3, x=3÷0.5, x=6;(2)23x+12x?23=0.5, 23x+12x=0.5+23, 76x=76, x=76÷76, x=1.

第一题答案是(18.6-5.4)除以6=6分之13.2

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