They break the glass into small peices.

=> The glass is broken into small peices.

Tập học các chữ trong từ Toán Học là:

A={ T ;O ;A ;N ;H ;C }

It's me. I very like ribi sanchi

Where do you live?

=> I live in Bien Hoa city.

What is your hobby?

=> I like chicken very much.

Gọi số cần tìm là x

a) \(\dfrac{2}{3}\)của nó bằng 7,2

=> x.\(\dfrac{2}{3}\)=7,2

x=7,2:\(\dfrac{2}{3}\)

x=10,8

b) x.1\(\dfrac{3}{7}\)=-5

=> x= -5:1\(\dfrac{3}{7}\)

x=-3,5

A=\(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+\dfrac{1}{5.6}\)

=\(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{5}-\dfrac{1}{6}\)

=1\(-\dfrac{1}{4}+\dfrac{1}{5}-\dfrac{1}{6}\)

=\(\dfrac{47}{60}\)

B=\(\dfrac{2}{1.3}+\dfrac{2}{3.5}+\dfrac{2}{5.7}+...+\dfrac{2}{99.101}\)=

\(1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...\dfrac{1}{99}+\dfrac{1}{101}\)

=\(1-\dfrac{1}{101}\)

=\(\dfrac{100}{101}\)