a) \(2\dfrac{4}{9}+6\dfrac{7}{11}+7\dfrac{5}{9}+13\dfrac{4}{11}\)

\(=2+\dfrac{4}{9}+6+\dfrac{7}{11}+7+\dfrac{5}{9}+13+\dfrac{4}{11}\)

\(=\left(2+6+7+13\right)+\left(\dfrac{4}{9}+\dfrac{5}{9}\right)+\left(\dfrac{7}{11}+\dfrac{4}{11}\right)\)

\(=28+1+1\)

\(=30\)

b) \(\dfrac{3}{4}+\dfrac{1}{2}\times\dfrac{12}{5}-1\dfrac{1}{2}\)

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

\(=\dfrac{3}{4}-1\)

\(=\dfrac{3}{4}-\dfrac{4}{4}\)

\(=-\dfrac{1}{4}\) 

0,56 : 0,1 + 0,57 : 0,1 - 0,3

= ( 0,56 + 0,57 ) : 0,1 - 0,3

= 1,13 : 0,1 - 0,3

= 11,3 - 0,3

= 11

1, 

0,56 : 0,1 + 0,57 :0,1 - 0,3 

= ( 0,56 + 0,57-0,3 ) : 0,1

= 1 : 0,1

= 0,1

=1 day 

\(\frac{16,2.3,7+5,7.16,2-7,8.4,8-4,6.7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)

\(=\)\(\frac{16,2\left(3,7+5,7\right)-7,8\left(4,8-4,6\right)}{\left(11,2+12,3+13,4\right)-\left(12,6+11,5+10,4\right)}\)

\(=\)\(\frac{16,2.9-7,8.0,2}{36,9-34,5}\)

\(=\)\(\frac{145,8-1,56}{2,4}\)

\(=\)\(\frac{144,24}{2,4}\)

\(=\)\(60,1\)

\(\text{Học tốt!!!}\)

cảm ơn

đề sai

\(5,3\times6,7+\times6,7\times4,6+6,7:10\\ =5,3\times6,7+6,7\times4,6+\times6,7:\dfrac{10}{1}\\ =\times5,3\times6,7+6,7\times4,6+6,7\times\dfrac{1}{10}\\ =5,3\times6,7+6,7\times4,6\times+6,7\times0,1\\ =6,7\times\left(5,3+4,6+0,1\right)\\ =6,7\times10\\ =67\)

đáp án là -7.214

(16,2 x 3,6 + 5,7 x 16,2 - 6,2 x 4,7 -4,6 x 6,2) / (11,2 + 12,3 + 13,4 - 11,3 - 12,4 - 10,2)

= ( ( 16,2 x (3,6 + 5,7) ) - ( 6,2 x (4,7 - 4,6) ) ) / ( (11,2 - 10,2) + (12,3 - 11,3) + (13,4 - 12,4) )

= ( ( 16,2 x 9,3 ) - ( 6,2 x 0,1 ) ) / ( 1 + 1 + 1 )

= ( 150,66 - 0,62 ) / 3

= 150,04 / 3 

Chúc bạn học tốt <3

\(=\dfrac{16.2\cdot9.4-7.8\cdot9.4}{2,4}=\dfrac{8.4\cdot9,4}{2,4}=32.9\)

a/\(4,19\times50-132:\dfrac{2}{3}\)
\(=209,5-198\)
\(=11,5\)
b/\(637,38:18\times2,5\)
\(=35,41\times2,5\)
\(=88,525\)
c/\(56,32-13,4\times2,4\)
\(=56,32-32,16\)
\(=24,16\)
d/\(\dfrac{2}{5}:\left(\dfrac{4}{5}-\dfrac{1}{2}\right)\)
\(=\dfrac{2}{5}:\dfrac{3}{10}\)
\(=\dfrac{4}{3}\)

\(=\dfrac{5,7\times16,2+16,2\times3,7-6,2\times4,6}{13,4+12,3+11,2-10,4-11,5-12,6-0,4}\)

\(=\dfrac{16,2\times\left(5,7+3,7\right)-6,2\times\left(4,8+4,6\right)}{\left(13,4-0,4\right)+\left(12,3+11,2-11,5\right)-\left(10,4+12,6\right)}\)

\(=\dfrac{16,2\times9,4-6,2\times9,4}{13+12-23}\)

\(=\dfrac{152,58-58,28}{2}\)

\(=\dfrac{94}{2}\)

\(=47\)

Help meeee !

Tính tổng của phép tính sau :

( 3/4 + 3/28 + 3/70 + 3/130 + 3/208 ) = ?

Hỡi các thiên tài toán học, hãy giúp mình lần này !

                                                                                Trân trọng cảm ơn !