The method of raising common factor# 【1】 In the following groups of algebras, () ① 2 AB and a + B; 2 5 Mn and - M; 3 xy and - XY; 4 2x-y and 2XY A.①② B.②③ C.③④ D.①②③④ 【2】 The common factor of: integral 15x & # 178; YZ & # 179; and - 21xyz ^ 5 is_______________ 【3】 : factorize the polynomial 3A (X-Y) - B (X-Y), the common factor of which is () A.3a-b B.3（x-y） C.x-y D.3a+b 【4】 The method of quoting common factor is used to calculate 3 879×58+25×3 879+17×3879 【5】 The common factor of polynomial 14abx-8ab & # 178; X + 2aX is_____________ 【6】 Decomposition factor: a (a-b) - A + B=_________ 【7】 If X-Y = 1, xy = 5, then x & # 178; y-xy & # 178=__________ 【8】 If a + B = 3, a & # 178; B + AB & # 178; = 1, then ab=_________

The method of raising common factor# 【1】 In the following groups of algebras, () ① 2 AB and a + B; 2 5 Mn and - M; 3 xy and - XY; 4 2x-y and 2XY A.①② B.②③ C.③④ D.①②③④ 【2】 The common factor of: integral 15x & # 178; YZ & # 179; and - 21xyz ^ 5 is_______________ 【3】 : factorize the polynomial 3A (X-Y) - B (X-Y), the common factor of which is () A.3a-b B.3（x-y） C.x-y D.3a+b 【4】 The method of quoting common factor is used to calculate 3 879×58+25×3 879+17×3879 【5】 The common factor of polynomial 14abx-8ab & # 178; X + 2aX is_____________ 【6】 Decomposition factor: a (a-b) - A + B=_________ 【7】 If X-Y = 1, xy = 5, then x & # 178; y-xy & # 178=__________ 【8】 If a + B = 3, a & # 178; B + AB & # 178; = 1, then ab=_________

【1】 In the following groups of algebras, the one with common factor is (b)
① 2 AB and a + B; 2 5 Mn and - M; 3 xy and - XY; 4 2x-y and 2XY
A.①②
B.②③
C.③④
D.①②③④
【2】 The common factor of: integral 15x & # 178; YZ & # 179; and - 21xyz ^ 5 is___ 3xyz³____________
【3】 : factorize the polynomial 3A (X-Y) - B (X-Y), the common factor of which is (c)
A.3a-b
B.3（x-y）
C.x-y
D.3a+b
【4】 The method of quoting common factor is used to calculate
3 879×58+25×3 879+17×3879
=3879×(58+25+17)
=3879×100
=387900
【5】 The common factor of polynomial 14abx-8ab & # 178; X + 2aX is__ 2ax___________
【6】 Decomposition factor: a (a-b) - A + B=___ (a-b)(a-1)______
【7】 If X-Y = 1, xy = 5, then x & # 178; y-xy & # 178=
xy(x-y)= 5______
【8】 If a + B = 3, a & # 178; B + AB & # 178; = 1, then ab=__ 1/3_______