Toán Lớp 8: a)3/(x-7)+3/(x-7)+(-5)/(x^2-49) b)4/(x+2)+2/(x-2)+8/(4-x^2 )a)3/(x-7)+3/(x-7)+(-5)/(x^2-49) -

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Toán Lớp 8: a)3/(x-7)+3/(x-7)+(-5)/(x^2-49) b)4/(x+2)+2/(x-2)+8/(4-x^2 )a)3/(x-7)+3/(x-7)+(-5)/(x^2-49)

Chi Tháng Mười Hai 31, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: a)3/(x-7)+3/(x-7)+(-5)/(x^2-49)
b)4/(x+2)+2/(x-2)+8/(4-x^2 )a)3/(x-7)+3/(x-7)+(-5)/(x^2-49)

Comments ( 1 )

lyly98
31 Tháng Mười Hai, 2022 at 3:19 sáng

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a)3/(x-7)+3/(x-7)+(-5)/(x^2-49)=3/(x-7) +3/(x-7)+(-5)/(x-7)*(x+7)=3*(x+7)/(x-7)*(x+7) +3*(x+7)/(x+7)*(x-7)+(-5)/(x-7)*(x+7)=(3*(x+7)+3*(x+7)-5)/(x-7)*(x+7)=3x+21+3x+21-5/(x-7)*(x+7)=6x+37/(x-7)*(x+7)

b)4/(x+2)+2/(x-2)+8/(4-x^2)=4/(x+2)-2/(2-x)+8/(2-x)*(2+x)=4*(2-x)/(x+2)*(2-x)-2*(2+x)/(2-x)*(2+x)+8/(2-x)*(2+x)=(4*(2-x)-2*(2+x)+8)/(2-x)*(2+x)=8-4x-4-2x+8/(2-x)*(2+x)=-6x+12/(2-x)*(2+x)=

6(-x+2)/(2-x)*(2+x)=6/2+x

Còn câu C giống câu a nha

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