如图角1= 角2 =角3 ,AB=AD.求正:BC=DE-搜答案-搜搜做题作业网

ab+a=-2,ab+b=-10两等式相减,得：a-b=8-2a-{-4b-3[(ab+a)²-a]}-1/2[(ab+b)²-2b]=-2a-{-4b-3[(-2)²-

(2-ab+2a+5b)-(3ab+2b-2a)-(3a+4b-ab)=2-ab+2a+5b-3ab-2b+2a-3a-4b+ab=a-b-4ab+2=4-4+2=2

(-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

(-2ab+2a+3b)-(3ab+2b-2a)-(a+4b+ab)=-2ab+2a+3b-3ab-2b+2a-a-4b-ab=(-2ab-3ab-ab)+(2a+2a-a)+(3b-2b-4b)=-

再答：不懂欢迎追问再答：满意麻烦采纳一下谢谢

(a-1)²+|b+1|=0a-1=0、b+1=0解得：a=1、b=-13ab-2(a²-ab)-(a²-ab)=3ab-3(a²-ab)=3ab-3a

a^2-3ab+b^2/ab=( )/ab-3

a^2-3ab+b^2/ab=(a^2+b^2)/ab-3

（3a-4b-ab)-(a-2b+3ab)=3a-4b-ab-a+2b-3ab=2a-2b-4ab=2（a-b）-4ab=2×（-1）-4×（-2）（将a-b=-1,ab=-2代入）=-2+8=6

a^2-3ab+b^2/ab=(a^2+b^2)/ab-3

可以确定再答：因为a＋b=A,ab=A＋2011,则1-2(a＋ab)＋(ab-2b)=1-2a-2ab＋ab-2b=1-ab-2(a＋b)=1-A-2011-2A=3A,所以A=-335,所以a＋b

''^''表示几次方的意思,如3的3次方=3^3一、[2ab(ab+2)-(ab+1)2+(ab+1)(ab-1)+2]÷(-ab)=(2a^2b^2+4ab-a^2b^2-2ab-1+a^2b^2-

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+

2a^2b+ab^2-3a^b+5ab-2ab^2-3ab=-a^2b-ab^2+2ab=-ab(a+b)+2ab=-10×1+2×10=10

最后等于4,关键就在于-a-b那里要添括号变成-(a+b)就好

(2a-3b-ab)-(a-2b+3ab)=2a-3b-ab-a+2b-3ab=a-b-4ab=-1-4×（-2）=7

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=-2ab+10a+3b-3ab+3a+6b+2a+6b+2ab=15a+15b-3ab=15(a+b)-3ab=15×1-3×(-2)=21

原式=2a+3b-2ab-a-4b-ab-3ab-2b+2a=3a-3b-6ab=3(a-b)-6ab=3*3-6*1=3

如图 角1= 角2 =角3 ,AB=AD.求正:BC=DE