\(1\frac{4}{23}+\frac{5}{21}-\frac{4}{23}+0,5+\frac{16}{21}\)

\(=\frac{27}{23}+\frac{5}{21}-\frac{4}{23}+\frac{1}{2}+\frac{16}{21}\)

\(=\left(\frac{27}{23}-\frac{4}{23}\right)+\left(\frac{5}{21}+\frac{16}{21}\right)+\frac{1}{2}\)

\(=\frac{23}{23}+\frac{21}{21}+\frac{1}{2}\)

\(=1+1+\frac{1}{2}\)

\(=\frac{5}{2}\)

5^2 bạn ơi

27/23+5/21-4/23+1/2+16/21=(27/23-4/23)+(5/21+16/21)+1/2

                                            =1+1+1/2

                                            =5/2

các bạn thấy hợp lý thì k đúng cho mình nhé........yêu các bạn nhiều

a) \(1\frac{4}{23}+\frac{5}{21}-\frac{4}{23}+0,5+\frac{16}{21}\)

\(=1\frac{4}{23}-\frac{4}{23}+\left(\frac{5}{21}+\frac{16}{21}\right)+0,5\)

\(=1+1+0,5=2,5\)

b) \(\frac{3}{7}.19\frac{1}{3}-\frac{3}{7}.33\frac{1}{3}=\frac{3}{7}.\left(19\frac{1}{3}-33\frac{1}{3}\right)\)

\(=\frac{3}{7}.\left(-14\right)=-6\)

c) \(15\frac{1}{4}:\left(-\frac{5}{7}\right)-25\frac{1}{4}:\left(-\frac{5}{7}\right)\)

\(=\left(15\frac{1}{4}-25\frac{1}{4}\right):\left(-\frac{5}{7}\right)\)

\(=\left(-10\right):\left(-\frac{5}{7}\right)\)

\(=14\)

a) \(1\frac{4}{23}+\frac{5}{21}-\frac{4}{23}+0,5+\frac{16}{21}\)

\(=\left(\frac{27}{23}-\frac{4}{23}\right)+\left(\frac{5}{21}+\frac{16}{21}\right)+0,5\)

\(=1+1+0,5\)

\(=2+0,5\)

\(=2,5.\)

b) \(\frac{3}{7}.19\frac{1}{3}-\frac{3}{7}.33\frac{1}{3}\)

\(=\frac{3}{7}.\left(\frac{58}{3}-\frac{100}{3}\right)\)

\(=\frac{3}{7}.\left(-14\right)\)

\(=-6.\)

c) \(15\frac{1}{4}:\left(-\frac{5}{7}\right)-25\frac{1}{4}:\left(-\frac{5}{7}\right)\)

\(=\left(\frac{61}{4}-\frac{101}{4}\right):\left(-\frac{5}{7}\right)\)

\(=\left(-10\right):\left(-\frac{5}{7}\right)\)

\(=14.\)

Chúc bạn học tốt!

\(\frac{5}{21}\)+ \(0,5\) - \(\frac{19}{23}+\frac{16}{21}-\frac{4}{23}\)= 0,5

Chúc học tốt!!!

bạn ghi rõ được ko

=(\(\frac{5}{21}\)+\(\frac{16}{21}\))-( \(\frac{19}{23}\)+\(\frac{4}{23}\)) + 0,5

=1-1+0,5

=0,5

Đề Này Không tính nhanh được đâu bạn 

Minh tính Ra kết quả là :

\(\frac{2257}{378}\)

Đúng rồi đó nhưng có thể ghép 7/23+16/23=23/23=1
 

=22/17  +16/27  -5/17 +0,5+7/23

=1+0,5+16/27+7/23

=2977/1242

\(1\frac{5}{17}+\frac{16}{27}-\frac{5}{17}+0.5+\frac{7}{23}\)

\(=1+\frac{5}{17}+\frac{16}{27}-\frac{5}{17}+\frac{1}{2}+\frac{7}{23}\)

\(=1+\frac{16}{27}+\frac{1}{2}+\frac{7}{23}+\left(\frac{5}{17}-\frac{5}{17}\right)\)

\(=\frac{43}{27}+\frac{37}{46}+0\)

\(=\frac{1978}{1242}+\frac{999}{1242}\)

\(=\frac{2977}{1242}\)

Giúp mik với mn ơi

1.\(\left(-\frac{6}{5}+\frac{6}{16}-\frac{6}{23}\right):\left(\frac{9}{5}-\frac{9}{16}+\frac{9}{23}\right)\)

\(=6\left(-\frac{1}{5}+\frac{1}{16}-\frac{1}{23}\right):\left(-9\right)\left(\frac{-1}{5}+\frac{1}{16}-\frac{1}{23}\right)\)

\(=6:\left(-9\right)=-\frac{2}{3}\)

2. \(\frac{\frac{3}{7}-\frac{3}{11}+\frac{3}{13}}{\frac{5}{7}-\frac{5}{11}+\frac{5}{13}}+\frac{0.5-\frac{1}{3}+\frac{1}{4}}{-\frac{3}{2}+1-\frac{3}{4}}\)

\(=\frac{3\left(\frac{1}{7}-\frac{1}{11}+\frac{1}{13}\right)}{5\left(\frac{1}{7}-\frac{1}{11}+\frac{1}{13}\right)}+\frac{\frac{1}{2}-\frac{1}{3}+\frac{1}{4}}{-3\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{4}\right)}\)

\(=\frac{3}{5}-\frac{1}{3}\)

\(=\frac{9}{13}-\frac{5}{15}=\frac{4}{15}\)

\(1\frac{4}{23}+\frac{5}{21}-\frac{4}{23}+0,5+\frac{16}{21}\)

= \(\left(1\frac{4}{23}-\frac{4}{23}\right)+\left(\frac{5}{21}+\frac{16}{21}\right)-0,5\)

= 1+1-0,5

=1,5