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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.

(1)0.5×(X-0.4)=5.8, 0.5×X-0.5×0.4=5.8 0.5X-0.2=5.8, 0.5X-0.2+0.2=5.8+0.2, 0.5X=6, 0.5X÷0.5=6÷0.5, X=12;(2)310+710X=3110, 310+710X-310=3110-310, 710X=145, 710X×107=145×107, X=4;(3)34:12=X:45, 12X=34×45, 12...

0.4x-12.6=8.4求未知数x x=52.5

(1)3x-4×6=48 3x-24=483x-24+24=48+243x=723x÷3=72÷3x=24;(2)12x-25%x=150.25x=150.25x÷0.25=15÷0.25x=60;(3)312:x=0.7:40.7x=312×40.7x=140.7x÷0.7=14÷0.7x=20;(4)x3.6=5:9. 9x=3.6×5 9x=189x÷9=18÷9x=2.

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(1)4x-0.2=6 4x-0.2+0.2=6+0.2 4x=6.2 4x÷4=6.2÷4 x=4.55(2)x+(13+34)=2 x+1312=2 x+1312-1312=2-1312 x=1112

(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) 2 5 x+ 1 2 x=0.8÷ 2 9 , 0.9x=3.6, 0.9x÷0.9=3.6÷0.9, x=4;(2) 3 20 :18%= 6.5 x , 3 20 x=18%×6.5, 3 20 x=1.17, 3 20 x÷ 3 20 =1.17÷ 3 20 , x=7.8.

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