a b=2,a-b=3,求a的二次方减b的二次方
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![a b=2,a-b=3,求a的二次方减b的二次方](/uploads/image/f/426873-57-3.jpg?t=a+b%3D2%2Ca-b%3D3%2C%E6%B1%82a%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9%E5%87%8Fb%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9)
(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)=3a-3b-6ab=3(a-b)-6ab=3*2-6*(-3)=6+18=24
(-2ab+2a+3b)-(3ab+2b-2a)-(a+4b+ab)=-2ab+2a+3b-3ab-2b+2a-a-4b-ab=-6ab+3a-3b=-6ab+3(a-b)=6
(-2ab+2a+3b)-(3ab+2b-2a)-(a+4b+ab)=-2ab+2a+3b-3ab-2b+2a-a-4b-ab=-6ab+3a-3b=-6ab+3(a-b)=-6*1+3*4=-6+1
因为|3a+1|>=0,(2b-1)²>=0|3a+1|+(2b-1)²=0,所以:3a+1=0,2b-1=0a=-1/3,b=1/2(3a^2-2b^3)/ab=7/2
(A的二次方+B的二次方)除以二减AB=(A²-2AB+B²)/2=(A-B)²/2=2²/2=2
(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)=2a+3b-2ab-a-4b-ab-3ab-2b+2a=3a-3b-6ab=3(a-b)-6ab已知a-b=3,ab=-33(a-b
原式=5a²b(a-b)-3ab(a-b)²-5ab²(a-b)=ab(a-b)[5a-3(a-b)-5b]=ab(a-b)(5a-3a+3b-5b)=ab(a-b)(2
(a-b)*(3a+2b)=0b/a=-3/2a/b-b/a-(a*a+b*b)/ab=-2b/a=3
a的2方+ab-2b的二方=0(a+2b)(a-b)=0a=-2b或a=b当a=-2b时,2a+b分之2a-b=(-4b+b)/(-4b-b)=3/5当a=b时,2a+b分之2a-b=(2b-b)/(
再问:不对是错的是-3再答:哪的题再问:暑假作业上的题再答:再答:答案错了用二项式定理你看一眼我写的
a-b=3ab2a-2b-ab/a-b+2ab=6ab-ab/3ab+2ab=5ab/5ab=1
a-b=3,ab=-2(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)=2a+3b-2ab-a-4b-ab-3ab-2b+2a=3a-3b-6ab=3*3-6*(-2)=21
把a+b=1,ab=-2代入(-2ab+10a+3b)-3(ab-a-2b)+2(a+3b+ab)=(-2*-2+10a+3b)-3*(-2-a-2b)+2(a+3b-2)=4+10a+3b+3a+2
由条件去分母得a^2+b^2=3ab,代入合并约分得2
由1-2(a+ab)+(ab-2b)=3A1-2a-2ab+ab-2b=3A1-2(a+b)-ab=3A1-2A-(A+2008)=3A1-2A-A-2008=3A6A=-2007A=-334.5a+
1-2(a+ab)+(ab-2b)=1-2(a+b)-ab=1-2A-A-2008=3A,A=-669/2,所以a+b=-669/2,ab=-3347/2☆⌒_⌒☆诚心为您解答每一个问题!您的好评是我
原式=2a+3b-2ab-a-4b-ab-3ab-2b+2a=3a-3b-6ab=3(a-b)-6ab=3*3-6*1=3
ab/a+b=3ab=3(a+b)2ab/a+b-5(a+b)/ab=6(a+b)/(a+b)-5(a+b)/3(a+b)=6-5/3=13/3
ab/(a+b)=3,a+b=ab/3原式=[3(a+b)+ab]/[2(a+b)-ab]=[3(ab/3)+ab]/[2(ab/3)-ab]=2ab/(-ab/3)=-6