计算:(b-a)^7(a-b)^n+(a-b)^n+1(b-a)^68(3^2+1)(3^4+1)(3^8+1)...(
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/13 13:41:49
计算:
(b-a)^7(a-b)^n+(a-b)^n+1(b-a)^6
8(3^2+1)(3^4+1)(3^8+1)...(3^32+1)+1
200^2-199^2+198^2-197^2+...+2^2-1^2
分解因式:
81-3y^3
2x^4-18y^4
ab-a+ab^2-ab^3
一两步过程,尽量快,
(b-a)^7(a-b)^n+(a-b)^n+1(b-a)^6
8(3^2+1)(3^4+1)(3^8+1)...(3^32+1)+1
200^2-199^2+198^2-197^2+...+2^2-1^2
分解因式:
81-3y^3
2x^4-18y^4
ab-a+ab^2-ab^3
一两步过程,尽量快,
(b-a)^7(a-b)^n+(a-b)^n+1(b-a)^6
=-(a-b)^7(a-b)^n+(a-b)^(n+1)(a-b)^6
=-(a-b)^(7+n)+(a-b)(n+1+6)
=-(a-b)^(n+7)+(a-b)^(n+7)
=0
8(3^2+1)(3^4+1)(3^8+1)...(3^32+1)+1
=(3^2-1)(3^2+1)(3^4+1)(3^8+1)...(3^32+1)+1
=(3^4-1)(3^4+1)(3^8+1)...(3^32+1)+1
=……
=3^64-1+1
=3^64
200^2-199^2+198^2-197^2+...+2^2-1^2
=(200+199)(200-199)+(198+197)(198-197)+……+(2+1)(2-1)
=(200+199)*1+(198+197)*1+……+(2+1)*1
=200+199++……+2+1
=(200+1)+(199+2)+……+(101+100)
=201*100
=20100
分解因式:
81-3y^3
=-3(y^3-27)
=-3(y-3)(y^2+3y+9)
2x^4-18y^4
=2(x^4-9y^4)
=2(x^2+3y^2)(x^2-3y^2)
ab-a+ab^2-ab^3
=a(b-1)-ab^2(b-1)
=a(b-1)(1-b^^2)
=-a(b-1)^2(b+1)
=-(a-b)^7(a-b)^n+(a-b)^(n+1)(a-b)^6
=-(a-b)^(7+n)+(a-b)(n+1+6)
=-(a-b)^(n+7)+(a-b)^(n+7)
=0
8(3^2+1)(3^4+1)(3^8+1)...(3^32+1)+1
=(3^2-1)(3^2+1)(3^4+1)(3^8+1)...(3^32+1)+1
=(3^4-1)(3^4+1)(3^8+1)...(3^32+1)+1
=……
=3^64-1+1
=3^64
200^2-199^2+198^2-197^2+...+2^2-1^2
=(200+199)(200-199)+(198+197)(198-197)+……+(2+1)(2-1)
=(200+199)*1+(198+197)*1+……+(2+1)*1
=200+199++……+2+1
=(200+1)+(199+2)+……+(101+100)
=201*100
=20100
分解因式:
81-3y^3
=-3(y^3-27)
=-3(y-3)(y^2+3y+9)
2x^4-18y^4
=2(x^4-9y^4)
=2(x^2+3y^2)(x^2-3y^2)
ab-a+ab^2-ab^3
=a(b-1)-ab^2(b-1)
=a(b-1)(1-b^^2)
=-a(b-1)^2(b+1)
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