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Toán Lớp 8: lam cac phep tinh sau a, 4xy-5/10x^3y – 6y^2-5/10x^3y b, 7x+6/2x(x+7) – 3x+6/2x^2+14x

Home/ Toán Lớp 8: lam cac phep tinh sau a, 4xy-5/10x^3y – 6y^2-5/10x^3y b, 7x+6/2x(x+7) – 3x+6/2x^2+14x

Toán Lớp 8: lam cac phep tinh sau a, 4xy-5/10x^3y – 6y^2-5/10x^3y b, 7x+6/2x(x+7) – 3x+6/2x^2+14x

Thanh Hùng Tháng Hai 10, 2023 Toán học 2 Comments 0 views

Toán Lớp 8: lam cac phep tinh sau
a, 4xy-5/10x^3y – 6y^2-5/10x^3y
b, 7x+6/2x(x+7) – 3x+6/2x^2+14x

Comments ( 2 )

tuyethutanhthu
10 Tháng Hai, 2023 at 7:24 sáng

Reply

a)

(4xy-5)/(10x^3y)-(6y^2-5)/(10x^3y)

=(4xy-5-6y^2+5)/(10x^3y)

=(4xy-6y^2)/(10x^3y)

=(2y(2x-3y))/(10x^3y)

=(2x-3y)/(5x^3)

b)

(7x+6)/(2x(x+7))-(3x+6)/(2x^2+14x)

=(7x+6)/(2x(x+7))-(3x+6)/(2x(x+7))

=(7x+6-3x-6)/(2x(x+7))

=(4x)/(2x(x+7))

=2/(x+7)
dananhnhu2k4
10 Tháng Hai, 2023 at 7:24 sáng

Reply

Bạn tham khảo:

a,(4xy-5)/(10x^3y) – (6y^2-5)/(10x^3y)

=(4xy-5-(6y^2-5))/(10x^3y)

=(4xy-5-6y^2+5)/(10x^3y)

=(4xy-6y^2)/(10x^3y)

=(2y(2x-3y))/(10x^3y)

=(2x-3y)/5x^3

b,(7x+6)/(2x(x+7)) – (3x+6)/(2x^2+14x)

=(7x+6)/(2x(x+7))-(3x+6)/(2x(x+7))

=(7x+6-(3x+6))/(2x(x+7))

=(7x+6-3x-6)/(2x(x+7))

=(4x)/(2x(x+7))

=2/(x+7)

#Wibu

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