giúp mik v

\(19\dfrac{1}{4}\text{+}\dfrac{1}{2}.2\dfrac{1}{3}\text{+}5,75-\dfrac{1}{6}\text{+}74\)

=\(\dfrac{77}{4}\text{+}\dfrac{1}{2}.\dfrac{7}{3}\text{+}\dfrac{23}{4}-\dfrac{1}{6}\text{+}74\)

=\(\dfrac{77}{4}\text{+}\dfrac{23}{4}\text{+}\dfrac{7}{6}-\dfrac{1}{6}\text{+}74\)

=\(25\text{+}1\text{+}74\)

=\(100\)

10

10

\(\dfrac{1}{6}\) giờ = 60 phút \(\times\) \(\dfrac{1}{6}\) = 10 phút

0,785

1/5

1/2 x 1/2 x 3/,14 = 0,785

2/5 : 2 = 1/5

\(\frac{1}{2}x\frac{1}{2}x3,14=0,785\)

\(\frac{2}{5}:2\)\(=\frac{1}{5}\)

5/7 . 1/x = 29/30

=> 5.30 = 29.7x

150 = 203x

x= 150/203

\(\frac{5}{7}:x=\frac{1}{6}+\frac{4}{5}\)

\(\frac{5}{7}:x=\frac{29}{30}\)

\(x=\frac{5}{7}:\frac{29}{30}\)

\(x=\frac{150}{203}\)

5/7 : X = 1/6+4/5

5/7 : X=29/30

 X=5/7:29/30=150/203

\(A=19\frac{1}{4}+\frac{1}{2}\times2\frac{1}{3}+5,75-\frac{1}{6}+74\)

MK GHI ĐẦY ĐỦ RA RÙI, BẠN TỰ BẤM MÁY TÍNH LÀM NHA ( MÌNH LƯỜI )

\(A=19\frac{1}{4}+\frac{1}{2}\times2\frac{1}{3}+5,75-\frac{1}{6}+74\)

\(A=\frac{77}{4}+\frac{1}{2}\times\frac{7}{3}+\frac{23}{4}-\frac{1}{6}+74\)

\(A=\frac{77}{4}+\frac{7}{6}+\frac{23}{4}-\frac{1}{6}+74\)

\(A=(\frac{77}{4}+\frac{23}{4})+(\frac{7}{6}-\frac{1}{6})+74\)

\(A=25+1+74\)

\(A=26+74\)

\(A=100\)

Llkogvhhvcudycvkuwyvukvdyckuyvculvycduydvclduydcyludvdulyerguc

\(\left(3\frac{1}{2}+5\frac{2}{3}\right)\times\frac{8}{19}-\left(2\frac{1}{2}+4\frac{2}{3}\right)\times\frac{8}{19}\)

\(=\frac{8}{19}\times\left[\left(3\frac{1}{2}+5\frac{2}{3}\right)-\left(2\frac{1}{2}+4\frac{2}{3}\right)\right]\)

\(=\frac{8}{19}\times\left(3\frac{1}{2}+5\frac{2}{3}-2\frac{1}{2}-4\frac{2}{3}\right)\)

\(=\frac{8}{19}\times\left[\left(3\frac{1}{2}-2\frac{1}{2}\right)+\left(5\frac{2}{3}-4\frac{2}{3}\right)\right]\)

\(=\frac{8}{19}\times\left(1+1\right)\)

\(=\frac{8}{19}\times2=\frac{16}{19}\)

A

a

A