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9X一2=5x十30

4x等于32 x等于8

3x-4=5-x 4x-4=5 4x =9 x =四分之九

(-2)×4/5×(-9/10)×(-2/3) =(-8/5)×(-9/10)×(-2/3) =36/25×(-2/3) =-24/25

(1)5x+9=34, 5x+9-9=34-9, 5x÷5=25÷5, x=5;(2)1.6x-1.2=10,1.6x-1.2+1.2=10+1.2, 1.6x÷1.6=11.2÷1.6, x=7;(3)10x-2x+28=36, 8x+28-28=36-28, 8x÷8=8÷8, x=1;(4)6x-0.5×6=2.4, 6x-3+3=2.4+3, 6x÷6=5.4÷6, x=0.9.

(1)由原方程移项、合并同类项,得12x=6,化未知数系数为1,得x=12;(2)由原方程去括号,得5x-5-6x+2=4x-1,移项,合并同类项,得-5x=2,化未知数系数为1,得x=-25;(3)由原方程去分母,得3x-5x-11=6+4x-8,移项、合并同类项,得-4x=9,化...

3x+2x+3/2x=5/2 x=5/13 x+1-2x+2-1+3x=0 2x=-2 x=-1 2x-2-5x-3=6x+3+x-4 -10x=4 x=-2/5 1/2x-5x-2x=-11/6+1-8/6 -13/2x=-13/6 x=1/3 11/9m+2/9m=1/7-2 13/9m=-13/7 m=-9/7 3/5x-x/5=1/4+2 2/5x=9/4 x=45/8 .

x?1x2?9÷(xx?3-5x?1x2?9)=x?1x2?9÷[x(x+3)x2?9-5x?1x2?9]=x?1x2?9÷x2?2x+1x2?9=x?1(x+3)(x?3)?(x+3)(x?3)(x?1)2=1x?1,当x=3tan30°+1=3×33+1=3+1时,原式=13+1?1=1

一、去括号得14x-10=3,移项得14x=3+10,合并同类项得14x=13,系数化为1得x=13/14 二、移项得3x-9x=-2+42,合并同类项得-6x=40,系数化为1得x=-20/3 三、去括号得4x+2-5x-1=6,移项得4x-5x=6-2+1,合并同类项得-x=5,系...

8.2x=32.8 x=32.8/8.2 x=____

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