c: \(\dfrac{2x}{x+5}+\dfrac{10x}{x^2+5x}\)

\(=\dfrac{2x}{x+5}+\dfrac{10x}{x\left(x+5\right)}\)

\(=\dfrac{2x}{x+5}+\dfrac{10}{x+5}=\dfrac{2x+10}{x+5}=\dfrac{2\left(x+5\right)}{x+5}=2\)

d: \(\dfrac{x}{x^2-36}+\dfrac{x-6}{x^2+6x}+\dfrac{-36}{\left(x^2-6x\right)\left(x+6\right)}\)

\(=\dfrac{x}{\left(x-6\right)\left(x+6\right)}+\dfrac{x-6}{x\left(x+6\right)}+\dfrac{-36}{x\left(x-6\right)\left(x+6\right)}\)

\(=\dfrac{x^2+\left(x-6\right)^2-36}{x\left(x-6\right)\left(x+6\right)}\)

\(=\dfrac{x^2+x^2-12x+36-36}{x\left(x-6\right)\left(x+6\right)}=\dfrac{2x^2-12x}{x\left(x-6\right)\left(x+6\right)}\)

\(=\dfrac{2\left(x^2-6x\right)}{\left(x^2-6x\right)\left(x+6\right)}=\dfrac{2}{x+6}\)

c, 18/-5 . -15/20

= 18.(-15)/(-5).20

= 270/100 = 27/10

d, 115/30 : - 5/6

= 115/30 . 6/-5

= 115.6/30.(-5)

= 690/-15

= -46

HỌC TỐT!

Trả lời:

= -46 nhé bn\

~HT~

Kick cho mik nha:33

b: góc BDC=góc BEC=90độ

=>BEDC nội tiếp

=>góc ADE=góc ABC

=>ΔADE đồng dạng với ΔABC

b: Xét ΔMDC và ΔMBE có

góc MDC=góc MBE

góc M chung

=>ΔMDC đồng dạng với ΔMBE

=>MD/MB=MC/ME

=>MD*ME=MB*MC

mn trả lời chi tiết cho e vs ạ

C

C

That is the _______where we do all our experiments.

A. laboratory             B. laboratorian        C. labor                      D. laborious

A

A .laboratory