X+X+4+X+4*2+X+4*3+...X+4*9=X+2X+4X+8X怎么解高手来
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X+X+4+X+4*2+X+4*3+...X+4*9=X+2X+4X+8X怎么解高手来
X+X+4+X+4*2+X+4*3+...X+4*9=X+2X+4X+8X怎么解高手来
X+X+4+X+4*2+X+4*3+...X+4*9=X+2X+4X+8X怎么解高手来
即X+X+X+……+X+4*(1+2+3+4+5+6+7+8+9)=X(1+2+4+8)
10X+4*45=15X
15X-10X=180
5X=180
X=180÷5
X=36
要方程进行观察,发现一定的规律在着手解题:
方程左边=10X+4*(1+2+……+8+9)
=10X+4*[(1+9)+(2+8)+……+(4+6)+5]
=10X+4*(4*10+5)
方程右边=X*(1+2+4+8)
=15X
解方程10X+4*(4*10+5)=15X
得 X=36
即a=2,b=-1,c=-1
判别式△=b²-4ac=1+8=9=3²
所以x=(1±3)/4
x1=(1-3)/4=-1/2
x2=(1+3)/4=1
原式=y(x+y)+(x-y)²-x²-2y²
=xy+y²+x²-2xy+y²-x²-2y²
=-xy
=-(-1/3)×3
=1
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X
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