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12÷(0.5x%1)=4 列方程

12÷(0.5x-1)=4 0.5x-1=12÷4 0.5x=3+1 x=4÷0.5 x=8

12÷(0.5x-1)=6 0.5x-1=2 0.5x=3 x=6

x÷1/4=5/12÷3/4 x*4=5/12*(4/3) x*4=5/9 x=5/36

(1)0.8x-0.5x=1.2 0.3x=1.2 0.3x÷0.3=1.2÷0.3 x=4;检验:把x=4代入原方程,左边=0.8×4-0.5×4=3.2-2=1.2,右边=1.2,因为左边=右边,所以x=4是原方程的解.(2)3×1.5+4x=14.5 4.5+4x=14.5 4.5+4x-4.5=14.5-4.5 4x=10 4x÷4=10÷4 x=2.5;检验:...

(1)12÷(0.5x-1)=6,12÷(0.5x-1)×(0.5x-1)=6(0.5x-1), 6(0.5x-1)=12, 6(0.5x-1)÷6=12÷6, 0.5x-1=2, 0.5x-1+1=2+1, 0.5x=3, 0.5x÷0.5=3÷0.5, x=6;(2)12:x= 1 8 : 1 4 , 1 8 x=12× 1 4 , 1 8 x=3, 1 8 x÷ 1 8 =3÷ 1 ...

12÷(0.5x-1)=6 12÷6=0.5x-1 0.5x-1=2 0.5x=3 x=6 8x÷(1.8+3)=1.5 8x=(1.8+3)*1.5=7.2 x=0.9

-2分之3

x/15+0.4=x/12-0.1解:移项得x/15-x/12=-0.4-0.1 两边同时乘以60,去分母得 60(x/15-x/12)=60(-0.4-0.1) 4x-5x=-24-6 -x=-30 x=30

方程变形得: 5x-0.1 2 -0.5= 4x-0.6 12 .故选C

X-80%=25%x14 x-0.8=3.5 x=4.3 1/2X+30%X=4/5÷20% 0.8x=4 x=5 (1-X):4=0.5:8 8(1-x)=2 1-x=1/4 x=3/4 1/2+20%X=0.875 0.5+0.2x=0.875 0.2x=0.375 x=1.857 4/9X-12x85%=3/8 4/9x-51/5=3/8 4/9x=423/40 x=3807/160

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