[40.5-(2.1+X)÷0.3]×0.2=6.1则么做

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[40.5-(2.1+X)÷0.3]×0.2=6.1则么做
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[40.5-(2.1+X)÷0.3]×0.2=6.1则么做
[40.5-(2.1+X)÷0.3]×0.2=6.1则么做

[40.5-(2.1+X)÷0.3]×0.2=6.1则么做
[40.5-(2.1+X)÷0.3]×0.2=6.1
[40.5-7-(x÷0.3)]×0.2=6.1
[32.5-(x÷0.3)]×0.2=6.1
32.5-(x÷0.3)=30.5
-(x÷0.3)=30.5-32.5
-(x÷0.3)=-2
x=2×10/3
x=10/6
x=5/3

【40.5-(2.1+X)÷0.3】×0.2=6.1 X是多少 0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=6(x+1.2)=18.6 x= 7x+2x = 8.1 x= (x-5)÷3=1.7 x=5(x+1.1)=15.5 x= 9x+25=70 x= 7x-4x=2.1 x= 40.5-(2.1+X)/0.3=30.5 X是多少? 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 X×X-3X+1=0求分式X×X÷〈X×X×X×X+3X×X+1〉 解方程:2.1÷x=0.3 ,7.2-x=4.3,x-0.84x=0.8,30×(x÷4)=60 ,84+x=10.2 解方程:2.1÷x=0.3 ,7.2-x=4.3,x-0.84x=0.8,30×(x÷4)=60 ,84+x=10.2 (x-1分之x²-x+1)÷1-x分之4x²-4x+1其中x满足x²+x-2=0 已知x²-3x+1=0,求式子(x+1+x-1分之2)÷x-1分之x的值. 6X-54=30 7X-36=13 3.5X+4=4.7 2X- 16=23 (X-9)÷7=6 (X+3)÷5=45 0.3X÷2=9 3x2.1+2X=13.49x(X-6)=54 4x(X+8.2)=40.5要地等式 (2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0 [40.5-(2.1+X)÷0.3]×0.2=6.1怎么做 [40.5-(2.1+X)÷0.3]×0.2=6.1则么做 已知X²-3x-2=0,求 2x-1 x-1 ----- ÷ -------- 的值 (x- x) x²-2x不能先求X (1-3/x+2)÷x-1/x²+2x-x/x+1,其中x满足x²-x-1=0 f(x)=x/(1+x) x>=0 f1(X)=f(X) fn(X)=fn-1[fn-1(x)]求fn(x)证明:f1(X)+2f2(X)+3f3(x)+……+nfn(X) lim(x→0) 1-cosx/x+x 2-[(x-y²)(3x+y)-(x+y)(3x-y²)]÷xy 等于多少?2、若不论x为何值,(ax+b)(x+2)=x²-4,则a的b次方是多少?3、已知x²+x-1=0,求2x的四次+2x的三次+2x+3 等于多少?