\(\frac{37.13-13}{24+37.12}=\frac{13.\left(37-1\right)}{2.12+37.12}=\frac{13.36}{12.\left(2+37\right)}=\frac{13.36}{12.39}=\frac{3}{3}=1\)
\(\frac{37.13-13}{24+37.12}=\frac{13-13}{24+12}=\frac{0}{36}=0\)
Tính nhanh
24. (16-5) -16.( 24-5 )
29 ( 9-13 ) -19 ( 29-13)
31 ,(-18) + 31 .(-81) - 31
-12 . 47 + (-12) .52 + (-12)
(-6 - 2 ) .(-6 + 2)
(-5 + 9 ) .(-4)
\(1\dfrac{13}{15}.0,75-\left(\dfrac{8}{15}+25\%\right).\dfrac{24}{47}-3\dfrac{12}{13}:3\)
a) -24 + 13 + 6 + 24
b ) 28 + ( -6 ) - 50 + 6
c) -27 + ( -789 ) + 9 -73 ) + 789
d) ( -23 ) + ( -17 ) + 50 + ( -10 )
Chứng minh rằng: 12 . 13 . 19 + 23 . 24 . 29 là hợp số
\(1\frac{13}{15}.0,75-\left(\frac{104}{195}+25\%\right).\frac{24}{47}-3\frac{13}{12}:3\)
giup voi
so sánh \(\dfrac{16}{9};\dfrac{24}{13}\)
\(\dfrac{-5}{9}+1\dfrac{5}{9}\cdot\left(\dfrac{3}{4}-\dfrac{2}{5}\right):7^2\)
\(1\dfrac{13}{15}\cdot0,75-\left(\dfrac{104}{195}+25\%\right)\cdot\dfrac{24}{47}-3\dfrac{12}{13}:3\)
\(1\dfrac{13}{15}\cdot\left(0,5\right)^2\cdot3+\left(\dfrac{8}{15}+1\dfrac{19}{60}\right):1\dfrac{23}{24}\)
CMR
B=17^5+24^4+13^21 chia het cho 10
a, 1990.1990-1992.1988
b, (1374.57+687.86):(26.13+74.14)
c, 37.13-13/ 24+37.12
