Question

1. Thực hiện phép tính

a) \(\frac{3}{4}.26\frac{1}{5}-\frac{3}{4}.44\frac{1}{5}\)

^{b)\(-\sqrt{25+2}\sqrt{16}\)}

2. Tìm x, biết

a) 2 + x = - 5

b)\(\xrightarrow[x+5]{x-1}=\frac{6}{7}\)

Giúp mình với.....

Answer 1

1a, \(\frac{3}{4}.26.\frac{1}{5}-\frac{3}{4}.44.\frac{1}{5}=\frac{3}{4}.\frac{1}{5}.\left(26-44\right)=\frac{3}{20}.\left(-18\right)=\frac{-27}{10}\)

b,\(-\sqrt{25+2}\sqrt{16}=-\sqrt{27}.4=-4\sqrt{27}\)

2a, 2+x=-5

=>x=-7

b, \(\frac{x-1}{x+5}=\frac{6}{7}\\ =>7\left(x-1\right)=6\left(x+5\right)\\ =>7x-7=6x+30\\ =>x=37\)

Answer 2

1a,

b,

2a, 2+x=-5

=>x=-7

b,