Google is the best!

(lên gg ý, đừng hỏi ở đây)

Mà em đừng hỏi thế nx nhá

^^

\(3,62\times73+2,2\times25+3,62\times27+1,8\times25\)

\(=3,62\times\left(73+27\right)+25\times\left(2,2+1,8\right)\)

\(=3,62\times100+25\times4\)

\(=3,62\times100+\left(25\times4\right)\)

\(=3,62\times100+100\times1\)

\(=100\times\left(3,62+1\right)\)

\(=100\times4,62\)

\(=462\)

\(\dfrac{2}{5}\times\dfrac{2}{7}+\dfrac{2}{5}\times\dfrac{5}{7}+\dfrac{2}{5}\times9\)

\(=\dfrac{2}{5}\times\left(\dfrac{2}{7}+\dfrac{5}{7}+9\right)\)

\(=\dfrac{2}{5}\times10\)

\(=4\)

\(15,3:\left(1+0,25\times16\right)\)

\(=15,3:\left(1+4\right)\)

\(=15,3:5\)

\(=3,06\)

Đề gì ?

\(0,12\times x=6\)

            \(x=6:0,12\)

            \(x=50\)

\(x\times0,1=\dfrac{2}{5}\)

\(x=\dfrac{2}{5}:0,1\)

\(x=\dfrac{2}{5}\times10\)

\(x=4\)

chịu

\(38\times y+y:0,25-y:0,5=80\times25\)

\(38\times y+y\times4-y\times2=80\times25\)

\(y\times\left(38+4-2\right)=80\times25\)

\(y\times40=80\times25\)

\(y\times40=2000\)

\(y=2000:40\)

\(y=50\)

-6/5

-8/5 . 1/8 + -8/5 . 7/8 + 2/5

= -8/5.(1/8 + 7/8)+ 2/5

= -8/5 . 1 + 2/5

= -8/5  + 2/5

= 6/5