tính bằng cách thuận tiện á

mà thôi ko làm đâu

kb nhé

hok tốt

22+33+55+44+11

=55+55+44+11

=110+44+11

=165

~B2k4~

(11+55)+(22+44)+33=66+66+33

                                 =66+99

                                 =165

ban giai ho minh

\(\left(-\frac{15}{22}\div-\frac{5}{11}\right)\cdot\frac{2}{3}\)

\(=\left(-\frac{15}{22}\cdot-\frac{11}{5}\right)\cdot\frac{2}{3}\)

\(=-\frac{3}{2}\cdot\frac{2}{3}\)

\(=-1\)

(-15/22: -5/11). 2/3

= ( -15 /22 x -11 / 5 ) x 2/3

=        3/2            x  2/3 

=             6/6

=            1

=(-15/22.-11/5).2/3

=3/2.2/3

=6/6=1
 

3\22*3\11*22

=9\22*11

=9\22

11\22

=9\11

9/11 ca hai cach

=9/11

a: \(=\dfrac{3}{22}\cdot22\cdot\dfrac{3}{11}=3\cdot\dfrac{3}{11}=\dfrac{9}{11}\)

b: \(=\dfrac{5}{6}\cdot\dfrac{2}{5}=\dfrac{1}{3}\)

c: =17/21(3/5+2/5)=17/21

sao không bấm máy tính cho nhanh bn

3/22 x 3/11 x 22=

c1:\(\frac{3\times3\times22}{22\times11}=\frac{9}{11}\)                              c2:\(\frac{9}{242}\times22=\frac{9}{11}\)

( 1/2 + 1/3 ) x 2/5=

c1:\(\frac{5}{6}\times\frac{2}{5}=\frac{1}{3}\)                                    c2:\(\frac{1}{2}\times\frac{2}{5}+\frac{1}{3}\times\frac{2}{5}=\frac{1}{5}+\frac{2}{15}=\frac{1}{3}\)

22 x 1 x 0 x 3.

= 22 x 0 x 3.

= 0 x 3.

= 0.

22.1.0.3

= 22.0.3

= 0.3

= 0

22.1.0.3=0