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求未知数x的值:x+ 1 2 x= 4 5 ...

(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 ...

解:根据比例的基本性质: 4/5:×=2:0.75 2x=4/5*0.75 2x=3/5 x=3/5÷2 x=3/10

(1)2x- 1 2 =0.5, 2x- 1 2 + 1 2 =0.5+ 1 2 , 2x÷2=1÷2, x=0.5 (2)x+ 5 4 x= 27 16 , 9 4 x= 27 16 , 9 4 x× 4 9 = 27 16 × 4 9 , x= 3 4 ;(3 )2:(1-x)= 4 5 , 4×(1-x)=2×5, 4×(1-x)÷4=10÷4, 1-x+x= 5 2 +x , 5 2 +x=1...

(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.

x-3/5+1/2=3/4 x-3/5=3/4-1/2 x-3/5=1/4 x=1/4+3/5 x=17/20

(1) 3 5 x+ 3 20 x=3 , 3 4 x=3 , 3 4 x× 4 3 =3× 4 3 ,x=4;(2)1.4×3+7x=5.6, 4.2+7x=5.6. 4.2+7x-4.2=5.6-4.2, 7x÷7=1.4÷7, x=0.2;(3)x:1.2= 5 4 , 4x=1.2×5,4x÷4=6÷4, x=1.5.

x@(4@2)=x@〔(4+2)/2〕=x@3=(x+3)/3=1.2 解得x=0.6

(1)4-16x=1 4-16x+16x=1+16x, 1+16x=4, 1+16x-1=4-1, 16x=3, 16x÷16=3÷16, x= 3 16 ;(2) 2 5 : 2 15 =x:(16-5), 2 15 x= 2 5 ×11, 2 15 x× 15 2 = 2 5 ×11× 15 2 , x=33;(3) 3 5 x- 3 10 x=1 5 7 , 3 10 x= 12 7 , 3 10 ...

(1)X-85%X=1.05, (1-0.85)X=1.05, 0.15X=1.05, 0.15X÷0.15=1.05÷0.15, X=7;(2)X:514=21:58, 58X=21×514, 58X=152, 58X÷58=152÷58, X=152×85, X=12;(3)4.5X-0.5=8.5, 4.5X-0.5+0.5=8.5+0.5, 4.5X=9, 4.5X÷4.5=9÷4.5, X=2.

(1) 5 6 x- 1 3 x=106, 1 2 x=106, 1 2 x×2=106×2,x=212; (2)42+8x=58, 42+8x-42=58-42, 8x÷8=16÷8, x=2;(3)3x-2× 3 4 =2.1, 3x-1.5=2.1, 3x-1.5+1.5=2.1+1.5, 3x÷3=3.6÷3, x=1.2; (4)6.5:x=3.25:4, 3.25x=6.5×4,3.25...

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