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化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)
化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1
4(x+y)-20(x+y)+25
∵(2x-1)+i=y-(3-y)i(2x+ay)-(4x-y+b)i=9-8i,∴
(2x+4y)(x-2y) (2x+3y)(2x-3y)(4x的二次i方+9y的二次方)
计算 [12(x+y)³(y-x)]³÷[4(x+y)²(x-y)]²
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
已知x,y互为共轭复数,且(x^2+y^2)-3xyi=4-6i,求|x|+|y|
4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解,
matlab中 I(x:y,x: