0.2x-2.8=8.6这道方程怎么解-搜答案-搜搜考试网

0.8x+2.8x=5.

3.6X=5.4X=1.5

16+0.2x=0.25x十9求x!

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2.3x+7.7x-5=2.8

2.3x+7.7x-5=2.810x=2.8+510x=7.8x=0.78

3+X=7/2.8X=5/2-3X=-1/22.5X=17.5X=74X-0.32=0.464X=0.78X=0.195

（X+X)+(X-X)+(X*X)+(X/X)=1002X+0+X*X+1=1002X+X*X=99X(X+2)=99X=9再问：请问X(X+2)=99解为什么就等于9了呢没看懂再答：换成算术法你就明

0.2x+0.4x=120.6x=12x=12÷0.6x=2020x+x=42021x=420x=420÷21x=20

(x-16.7%)/x=-8.6% X=?

（x-16.7%)/x=-8.6%(x-0.167)=0.086xx-0.086x=0.1670.914x=0.167x=0.1827133479

3-0.2=1.2X-0.8X2.8=0.4XX=7

(80.51-x)/x=0.2(80.51-x)=0.2x0.2x+x=80.511.2x=80.51x=80.51÷1.2x=8051/120（120分之8051）

X-X×0.2=1.18

当然能算出来X-X×0.2=1.18（1-0.2）X=1.180.8X=1.18解得X=1.475

x-2/0.2-x+1/0.5=3 x=?

再答：采纳啊。再答：谢谢。

x-0.2x=80 求x

x-0.2x=800.8X=80X=100在右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.

0.7x+12.3x=2.8+0.5x

0.7x+12.3x=2.8+0.5x13x-0.5x＝2.8……移项12.5x＝2.8……合并同类项X＝2.8÷12.5……系数化为1X＝28/125再问：2【x+5】+1.5=16.5再答：2【x

x-0.25x=2.8+0.20.75x=3x=3÷0.75x=4再问：其他三道？再答：1.26-2x=0.742x=1.26-0.742x=0.52x=0.52÷2x=0.261.3x+1.5x=0

1,3x-4+2x=4x-35x-4x=4-3x=12,2.8x=19.32-6.4x2.8x+6.4x=19.329.2x=19.32x=2.13,0.4(x-0.2)+1.5=0.7x-0.380

x-[(x-3500)*0.2-555]=9553x-[0.2x-700-555]＝95530.8x+1255=95530.8x=8298x=10372.5

8.4x-2.8x+6=80.8-1.2x

解8.4x-2.8x+6=80.8-1.2x8.4x-2.8x+1.2x=80.8-66.8x=74.8∴x=748/68=11∴x=11

8.6x+9.2=438.6+x x=?

8.6x+9.2=438.6+x8.6x－x=438.6－9.27.6x=429.4x=56.5

(2x-5)(3x+2)-6(x+1)(x-2)=6x²+4x-15x-10-6(x²+x-2x-2)=6x²-11x-10-6(x²-x-2)=6x²

(1)3x(x+0.2)=4x(x-1.1)

(1)3x(x+0.2)=4x(x-1.1)3x+0.6=4x-4.44x-3x=0.6+4.4x=5(2)乘以0.8得4(1-x)=3x4-4x=3x4=7xx=4/7（7分之4）（3）1.1x1.