a) 86 + 357 + 14 = ( 86 + 14 ) + 357
= 100 + 357 = 457
b) 72 + 69 + 128 = ( 72 + 128 ) + 69
= 200 + 69 = 269
c) 25 . 5 . 4 . 27 . 2 = ( 25 . 4 ) . ( 5 . 2 ) . 27
= 100 . 10 . 27
= 1000 . 27 = 27000
d) 28 . 64 + 28 . 36 = 28 . ( 64 + 36 )
= 28 . 100 = 2800
a)86+357+14
=(86+14)+357
=100+357
=457
b)72+69+128
=(72+128)+69
=200+69
=269
c)25.5.4.27.2
=(25.4).(5.2).27
=100.10.27
=27 000
d)28.64+28.36
=28(64+36)
=28.100
=2800
a) 86 + 357 + 14 = (86 + 14) + 357
= 100 + 357 = 457
b) 72 + 69 + 128 = (72 + 128) + 69
= 200 + 69 = 269
c) 25.4.5.27.2 = (25.4).(5.2).7 = 100.10.7 = 7000
d) 28.64 + 28.36 = 28.(64 + 36) = 28.100 = 2800
\(86+357+14=\left(86+14\right)+357=100+357=457\)
\(72+69+128=\left(72+128\right)+69=200+69=269\)
\(25.5.4.27.2=\left(25.4\right).\left(5.2\right).27=100.10.27=27000\)
\(28.64+28.36=28.\left(64+36\right)=28.100=2800\)
a)\(86+357+14=\left(86+14\right)+357\)\(=100+357=457\)
b) \(72+69+128=\left(72+128\right)+69=200+69=269\)
c) \(25\times5\times4\times27\times2=\left(25\times4\right)\times\left(5\times2\right)\times27\)
\(=100\times10\times27=1000\times27=27000\)
d) \(28\times64+28\times36=28\times\left(64+36\right)=28\times100=2800\)
a, 86 + 357 +14
= (86 + 14 ) + 357
= 100 +357
= 457
b, 72 +69 + 128
= (72 + 128 ) + 69
= 200 + 69
= 269
c, 25.5.4.27.2
= ( 25.4) .( 5.2).27
= 100.10 .27
= 1000.27
= 27000
đ, 28.64+28.36
= 28. (64+36)
= 28. 100
= 2800
k m nha iu các bn