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5500 x 500 : 5
= 5500 x (500 : 5)
= 5500 x 100
= 550000
mik nhah nhất nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3}{4}x\frac{4}{5}:\frac{3}{5}x\frac{6}{7}:\frac{1}{7}x\frac{5}{6}\)\(=\)\(\frac{3}{4}x\frac{4}{5}x\frac{5}{3}x\frac{6}{7}x\frac{7}{1}x\frac{5}{6}\)\(=\)\(\frac{3x4x5x6x7x5}{4x5x3x7x1x6}\)\(=\)\(\frac{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x5}{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x1}\)\(=\)\(\frac{5}{1}\)\(=\)\(5\).
![](https://rs.olm.vn/images/avt/0.png?1311)
= 54 x 997 + 54 x 2 + 998 + 54 x1
= 54 x ( 997 + 2 + 998 + 1)
= 54 x 1998
= 107 892
Có gì sai tthongg cảm nó!
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a) 15/21 + 7/21 + 5/21
= (15/21 + 5/21) + 7/21
= 20/21 + 7/21
= 27/21
b) 4/7 + 8/15 + 22/15
= 4/7 + 2
= 18/7
nha bn
a,\(\frac{15}{21}+\frac{7}{21}+\frac{5}{21}\)
= \(\left(\frac{15}{21}+\frac{5}{21}\right)+\frac{7}{21}\)
= \(\frac{20}{21}+\frac{7}{21}\)
=\(\frac{27}{21}\)
b, \(\frac{4}{7}+\frac{8}{15}+\frac{22}{15}\)
=\(\frac{4}{7}+\left(\frac{8}{15}+\frac{22}{15}\right)\)
= \(\frac{4}{7}+2\)
= \(\frac{18}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (36 + 54) x 7 + 7 x 9 + 7=
= 90 x 7 + 7x 9 + 7 x1 =
= 7 x ( 90 + 9 +1) =
= 7 x 100 = 700
b) 5/7 x 3 + 5/7 x 6 + 5/7 =
= 5/7 x (3 + 6 + 1) =
= 5/7 x 10 = 50/7
![](https://rs.olm.vn/images/avt/0.png?1311)
2021 x 73 ( 28 -1)
= 2021 x ( 73 + 27)
= 2021x 100
= 202 100
chúc bạn học tốt nha :)
2021 x (73 - 28 ) - 2021 = 2021 x 45 - 2021 = 2021 x (45 - 1 ) = 2021 x 44 = 88924
học tốt !
500 : 5 : 100
= ( 500 : 100 ) : 5
= 5 : 5
= 1
500 : 5 : 100
= (500 : 100 ) : 5
= 5 : 5
= 1
t cho mình nha