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Toán Lớp 8: a,2x^2-4xy b,x ²+xy-5x-5y c,(x ²+1) ²-4X ² d,C=(5x+3)(5x-3)-(5x+1) ² GIÚP MK VS MIK HỨA TRẢ ĐỦ

Home/ Toán Lớp 8: a,2x^2-4xy b,x ²+xy-5x-5y c,(x ²+1) ²-4X ² d,C=(5x+3)(5x-3)-(5x+1) ² GIÚP MK VS MIK HỨA TRẢ ĐỦ

Toán Lớp 8: a,2x^2-4xy b,x ²+xy-5x-5y c,(x ²+1) ²-4X ² d,C=(5x+3)(5x-3)-(5x+1) ² GIÚP MK VS MIK HỨA TRẢ ĐỦ

Hòa Tâm Tháng Bảy 7, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a,2x^2-4xy
b,x ²+xy-5x-5y
c,(x ²+1) ²-4X ²
d,C=(5x+3)(5x-3)-(5x+1) ²
GIÚP MK VS MIK HỨA TRẢ ĐỦ

Comments ( 2 )

ankim
7 Tháng Bảy, 2022 at 3:11 chiều

Reply

a/ 2x^2-4xy

= 2x(x-2y)

b/ x^2+xy-5x-5y

= x(x+y)-5(x+y)

= (x-5)(x+y)

c/ (x^2+1)^2-4x^2

= (x^2+1-2x)(x^2+1+2x)

d/ (5x+3)(5x-3)-(5x+1)^2

= 25x^2-9-25x^2-10x-1

= -10x-10 = -10(x+1)
lyly98
7 Tháng Bảy, 2022 at 3:11 chiều

Reply

a) 2x^2 – 4xy

= 2x (x-2y)

b) x^2 + xy – 5x – 5y

= x (x+y) – 5 (x+y)

= (x-5) (x+y)

c) (x^2+1)^2 – 4x^2

= (x^2+1)^2 – (2x)^2

= (x^2-2x+1) (x^2+2x+1)

= (x-1)^2 (x+1)^2

d) C = (5x+3) (5x-3) – (5x+1)^2

= (5x)^2 – 3^2 – (25x^2+10x+1)

= 25x^2 – 9 – 25x^2 – 10x – 1

= -10x – 10

= -10 (x+1)

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