a,714+382+286+318
\(=\left(714+286\right)+\left(382+318\right)\)
\(=1000+700\)
= \(1700\)
b,18.73+15.18+12.18
\(=18.\left(73+15+12\right)\)
\(=18.100\)
\(=1800\)
c,(37+63) : {250:[450-(4.5^3-2^2.25)]}
\(=100:\left\{250:\left[450-\left(2^2.125-2^2.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(2^2.\left(125-25\right)\right)\right]\right\}\)
\(=100:\left\{250:\left[450-400\right]\right\}\)
\(=100:\left\{250:50\right\}\)
\(=100:5\\ =20\)
CHÚC BANJ HỌC TỐT!!
a) 714+382+286+318
=(714+286)+(382+318)
=1000+700
=1700
b) 18.73+15.18+12.18
=18.(73+15+12)
=18.100
=1800
c) (37+63):{250:[450-(4.5^3-2^2.25)]}
=100:{250:[450-(4.125-4.25)]}
=100:{250:[450-4.(125-25)]}
=100:{250:[450-4.100]}
=100:{250:[450-400]}
=100:{250:50}
=100:5
=20
-Chúc bạn học tốt-
