a/64 x 23 + 37 x 23 - 23 + 6,24
= ( 64 + 37 - 1 ) x 23 + 6,24
= 100 x 23 + 6,24
= 2300 + 6,24
= 2306,24
b/33,76 + 19,52 + 6,24
= ( 33,76 + 6,24 ) + 19,52
= 40 + 19,52
= 59,52
c/\(\dfrac{38}{11}+\left(\dfrac{16}{13}+\dfrac{6}{11}\right)\)
\(=\dfrac{38}{11}+\dfrac{16}{13}+\dfrac{6}{11}\)
\(=\left(\dfrac{38}{11}+\dfrac{6}{11}\right)+\dfrac{16}{13}\)
\(=4+\dfrac{16}{13}\)
\(=\dfrac{52}{13}+\dfrac{16}{13}\)
\(=\dfrac{68}{13}\)
d/\(\dfrac{3}{4}:\dfrac{3}{5}-\dfrac{1}{5}\)
\(=\dfrac{3}{4}\times\dfrac{5}{3}-\dfrac{1}{5}\)
\(=\dfrac{5}{4}-\dfrac{1}{5}\)
\(=\dfrac{25}{20}-\dfrac{4}{20}\)
\(=\dfrac{21}{20}\)
#AvoidMe

48 ; 4 x 25 : 25

=(48 : 4) x (25 : 25)

=12 x 1

=12

chúc bạn hộc tốt

=(48:4)x(25:25)

=12x1

=12

Chúc học tốt

\(\dfrac{3}{7}+\dfrac{6}{11}+\dfrac{5}{11}\)
\(=\dfrac{3}{7}+\left(\dfrac{6}{11}+\dfrac{5}{11}\right)\)
\(=\dfrac{3}{7}+1\)
\(=\dfrac{3}{7}+\dfrac{7}{7}\)
\(=\dfrac{10}{7}\)

998 x 199,8 + 199,8 + 199,8

= 998 x 199,8 + 199,8 x 1 + 199,8 x 1

= 199,8 x (998 + 1 + 1)

= 199,8 x 1000

= 199800

998 x 199,8 + 199,8 + 199,8 

= 998 x 199,8 + 199,8 x 1 + 199,8 x 1

= 199,8 x (998 + 1 + 1)

= 199,8 x 100

= 19980

@Nguyễn Trần Thành Đạt sao 998 + 1 + 1 = lại = 100 ạ?

\(=\dfrac{5}{12}+\left(\dfrac{8}{17}+\dfrac{60}{17}\right)\\ =\dfrac{5}{12}+4=4\dfrac{5}{12}\)

=512+(817+6017)=512+4=4512

5/12 + 8/17 + 60/17

= 5/12 + 68/7

= 5/12 + 4/1

= 5/12 + 48/12

= 53/12

HT

14,5 x 89,55 +2 x 9,45 x 7,25 + 14,5

= 14,5 x 89,55 + 2 x 7,25 x 9,45 + 14,5 x 1

= 14,5 x 89,55 + 14,5 x 9,45 + 14,5 x 1

= 14,5 x ( 89,55 + 9,45 + 1 )

= 14,5 x 100

= 1450

~ HOK TỐT ~

\(34,4\times12-34,4:0,5\)

\(=34,4\times12-34,4\times2\)

\(=34,4\times\left(12-2\right)\)

\(=34,4\times10\)

\(=344\)

34,4 \(\times\) 12 - 34,4: 0,5

= 34,4 \(\times\) 12 - 34,4 \(\times\) 2

= 34,4 \(\times\) ( 12 - 2)

= 34,4 \(\times\) 10

= 344

\(=382,8-68,8\)

\(=314\)