80%x-100=100(1 20%)
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![80%x-100=100(1 20%)](/uploads/image/f/399075-51-5.jpg?t=80%25x-100%3D100%281+20%25%29)
两边乘以100425x+720*66-720x=500x+66*100-100x-90x-66*162+162x425x-720x-500x+100x+90x-162x=66*100-66*162-6
1X+2X+3X…+98X+99X+100X=5050x=50500x=10
x^4+x^3+x^2+x+1=0,x^100+x^99+x^98+x^97+x^96=x^96(x^4+x^3+x^2+x+1)=x^96*0=0
=x+(3x-2x)+(5x-4x)+……+(101x-100x)=x+x+……+x=51x=51×2/51=2
2x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/7
x-2x+3x-4x+...+99x-100x=25(1-2)x+(3-4)x+…+(99-100)x=25-x-x-…-x=25-50x=25x=-1/2
(4x/5)-80+100=8x/9(4x/5)+20=8x/9同时乘以45得到:36x+900=40x4x=900x=225再问:4x/5这是什么再答:x代表书的总页数4x/5代表总页数的5分之4(
14X-8X=12x=220X-50=50x=528+6X=88x=1024-3X=3x=799X=100-Xx=1X+3=18x=15X-6=12x=1856-2X=20x=184X+2=6x=1X
条件值在A1,在B1单元格输入:=LOOKUP(A1,{0;3.5;5;7},{-200;0;100;100})X>7,x=1005
(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
X+X+X+X+X+X+100X=1690106x=1690x=845/53
7*(80+x)=11*(100-X)560+7x=1100-11x18x=540x=30
2x+4x+6x...+100x=1-(x+3x+5x+...+99x)x(2+4+6+...+100)=1-x(1+3+5+...99)x(2+4+6+...+100)+x(1+3+5+...+99
(X/80+X/100+5)*40=X0.5x+0.4x+200=xx-0.5x-0.4x=2000.1x=200x=2000
(x+x)+(x-x)+(xx)+(x/x)=1002x+0+x²+1=100x²+2x+1=100(x+1)²=10²x+1=10或x+1=-10x=9或x=
2x=100x=50再问:过程呢??再答:3x=x+100移项:3x-x=1002x=100x=100/2x=50这样可以了吧
x+x/3=1004x/3=1004x=300x=75x+3x=1004x=100x=25100-x=x*34x=100x=25x=(100-x)*3x=300-3x4x=300x=75x+y=100
3x=100+x3x-x=1002x=100x=50
两边乘以400得4x+5x=900xx=0