20.5x-2.8+1.2=4.5x
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20.5x-2.8+1.2=4.5x
20.5x-2.8+1.2=4.5x
20.5x-2.8+1.2=4.5x
20.5x-4.5x =2.8-1.2-----------移项
16x=1.6-------------------------合并同类项
x=0.1----------------------------两边同除16
20.5x-2.8+1.2=4.5x
8.4x-2.8x+6=80.8-1.2x
(X+X)+(X-X)+(X*X)+(X/X)=100
9x+7x-x=4.5
x/4.5=1.2
2.8+x=10.35 5.2x-x=6.3 1.2x-4.5×0.8=4.5 2.7(x-6.5)=6.21解这些方程
6x?一2x?=24 2.8x?+1.26x?一2x?=24 2.8x?+1.2x?=3.6 是多少
20%x+20%x×30%x-20%x=4.5
6.5x-4.5x=93.6-6.5x-3.5x
4.5x+x=12
x+4.5x=0.
4.5X-X=3.5
x+24=4.5X
4.5x-x=10.5
4.5 x + x=22
8x-5.5x=7.57.2x÷3.6=2 3x+6x-8x=0.7 12x-2x-5x=4.512x-x=0 5x+x=1.8 3.2x+1.8x=64.8x-0.8x=6 6.3-0.3x=9.6 8.6x-8.5x=0.720x-2x=36 9x+6x=4.5 18x-12x=5.42x-1.6x=3.6 18x+3x=7×6 1.2x-0.5x=0.71.3x+2.7x=1 4x-3.2x=6.4 0.8x+3.2x+3x=562.8x-2x=7.2
1.2x=x+20
1.2X-30=X