63.66+63.54+120.37=63.(66+54)+120.37=63.120+120.37=120.(63.37)=120.100=12000

=12000 bn nhe !

CHÚC BN HỌC TỐT!!!!

 63 x 66+63x54+120x37

=63 x (66+54)+120 x 37

=63 x 120+120x37

=120x (63+37)

=120 x 100

=12000

208

178

208

178

300

300

= 300 

ta có: 2005 + 53-54-55+56-57-58-59+60+61-62-63+64+65-66-67+68+69

      = 2005+(53-54-55+56)+(57-58-59+60)+(61-62-63+64)+(65-66-67+68)+69

      = 2005+0+0+0+0+69

      = 2005+69

      = 2074

h

d: \(-37\cdot\left(-19\right)+37\left(-19\right)\)

\(=-19\left(-37+37\right)\)

\(=-19\cdot0=0\)

e: \(\left(29-9\right)\cdot\left(-9\right)+\left(-13-7\right)\cdot21\)

\(=20\cdot\left(-9\right)+\left(-20\right)\cdot21\)

\(=-20\left(9+21\right)\)

\(=-20\cdot30=-600\)

h: \(12\cdot\left(-47\right)+12\left(-19\right)+\left(-66\right)\cdot88\)

\(=12\left(-47-19\right)+\left(-66\right)\cdot88\)

\(=\left(-66\right)\cdot12+\left(-66\right)\cdot88\)

\(=-66\left(12+88\right)\)

\(=-66\cdot100=-6600\)

\(54+\left(-37+10-54+67\right)\)

\(=54-37+10-54+67\)

\(=\left(54-54\right)+\left(-37+67\right)+10\)

\(=0+30+10\)

\(=40\)

57+(-37+10-54+67)=54+(-14)=40

54+(-37+10-54+67)

=54-37+10-54+67

=(54-54)+10+(-37+67)

=0+10+30=40

43.37+43.73+57.66+57.44

=43.(37+73)+57.(66+44)

=43.110+57.110

=110.(43+57)

=110.100

=11000

=300

k mk nha 

mk k rùi đó

52 + 48 + 63 + 66 +37 + 34 = 300

300 tk nhe

nhung ban oi cho minh cach giai ro rang hon dc k