(5a+3b)(3a-5b)-(3a+b)(-b+3a)
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(5a+3b)(3a-5b)-(3a+b)(-b+3a)
计算:(附详细讲解(分析)、答案.)
1.(5a+3b)(3a-5b)-(3a+b)(-b+3a)
2.(1-1/2²)(1-1/3²)(1-1/4²)……(1-1/2013²)
3.已知m-n=4,m^2-n^2=24,求(m+n)^2
计算:(附详细讲解(分析)、答案.)
1.(5a+3b)(3a-5b)-(3a+b)(-b+3a)
2.(1-1/2²)(1-1/3²)(1-1/4²)……(1-1/2013²)
3.已知m-n=4,m^2-n^2=24,求(m+n)^2
/>(5a+3b)(3a-5b)-(3a+b)(-b+3a)
=15a^2-16ab-15b^2-(9a^2-b^2)
=15a^2-16ab-15b^2-9a^2+b^2
=7a^2-16ab-13b^2
2.(1-1/2²)(1-1/3²)(1-1/4²)……(1-1/2013²)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4)……(1-1/2013)(1+1/2013)
=1/2*3/2*2/3*4/3*3/4*5/4*……*2012/2013*2014/2013
=1/2*2014/2013
=1007/2013
3.已知m-n=4,m^2-n^2=24,求(m+n)^2
m^2-n^2=(m-n)(m+n)=24 m-n=4
m+n=6
(m+n)^2=36
=15a^2-16ab-15b^2-(9a^2-b^2)
=15a^2-16ab-15b^2-9a^2+b^2
=7a^2-16ab-13b^2
2.(1-1/2²)(1-1/3²)(1-1/4²)……(1-1/2013²)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4)……(1-1/2013)(1+1/2013)
=1/2*3/2*2/3*4/3*3/4*5/4*……*2012/2013*2014/2013
=1/2*2014/2013
=1007/2013
3.已知m-n=4,m^2-n^2=24,求(m+n)^2
m^2-n^2=(m-n)(m+n)=24 m-n=4
m+n=6
(m+n)^2=36
3a(a-b)-5b(a-b)
(3a-6b)/(a+b) - (5a-6b)/(a-b) - (4a-5b)/(a+b) - (7a-8b)/(a-b
(3a-6b/a+b)-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a)
因式分解(a-b)-3a+3b (a+b)(a-b)-2b(3a-5b)
[(a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a
(3a+2b)(6a-5b)(2b-3a)(5a+6b)
8a+2b+(5a - b) (5a-3b) -3 (a平方 - 2b)
5(a+b)-3(a-b)=2 2(a+b)+5(a-b)=7
计算:(b-a)^5(a-b)^m+(a-b)^(m+3)(b-a)^2
A=3 B=5 A=B B=A PRINT A,B
(a-2b)(2a+3b)-2(2b-a)(5a-b)
计算:(a-b)^m+3(b-a)^2(a-b)^m(b-a)^5