Question

B1:Thực hiện phép tính sau đây 

a 72.56+56.28        b53.125-24.53-53

c 42.53+47.156-47.114          d 28.76+28.25+28

e 37.59-37.3+49.37           f 2.14.18+3.12.17+4.69.9

Answer 1

a: \(72\cdot56+56\cdot28=56\left(72+28\right)=5600\)

b: \(53\cdot125-24\cdot53-53=53\left(125-24-1\right)=5300\)

c: \(42\cdot53+47\cdot156-47\cdot114=42\cdot53+47\cdot42=4200\)

d: \(28\cdot76+28\cdot25+28=28\cdot\left(76+25+1\right)=2800\)

e: \(37\cdot59-37\cdot3+37\cdot49=37\left(59-3+49\right)=3885\)

Answer 2

a) \(72.56+56.28=56\left(72+28\right)=56.100=5600\)

b) \(53.125-24.53-53=53\left(125-25-1\right)=53.100=5300\)

c) \(42.53+47.156-47.114=42.53+47\left(156-114\right)=42.53+47.42=42\left(53+47\right)=42.100=4200\)

d) \(28.76+28.25+28=28\left(76+25+1\right)=28.102=2856\)

e) \(37.59-37.3+49.37=37\left(59-3+49\right)=37.105=3885\)

f) \(2.14.18+3.12.17+4.69.9=36\left(14+17+69\right)=36.100=3600\)

Answer 3

a) = 56 . ( 72 + 28 )

 = 56 . 100

= 5600

b) = 53 . ( 125 - 24 - 1 )

= 53 . 100

= 5300

c) = 42 . 56 + 47 . ( 156 - 114 )

= 42 . 56 + 47 . 142

= 2352 + 6674

= ... 

d)= 28 . ( 76 +  25 +1 ) 

= 28 . 102

=...

e) = 37 . ( 59 - 3 + 49 )

= 37 . 13

=...