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Giải :
- ( 1999 + 313 ) – 1999 = 1999 – 1999 + 313 = 313
( 1435 + 213 ) – 13 = 1435 + ( 213 – 13 ) = 1435 + 200 = 1635
- 2034 – ( 34 + 1560 ) = ( 2034 – 34 ) – 1560 = 2000 – 1560 = 440
1972 – ( 364 + 972 ) = 1972 – 972 – 368 = 1000 – 368 = 632
c. 364 – ( 364 – 111 ) = 364 – 364 + 111 = 111
249 – ( 75-51 ) = ( 249 + 51 ) – 75 = 300 – 75 = 225
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
= ( 25 . 4 ) . 5 . 27
= 100 . 5 . 27
= 500 . 27
= 13500
d) 28 . 64 + 28 . 36
= 28 . ( 64 + 36 )
= 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)
\(25.5.4.27.2=\left(25.4\right).\left(5.2\right).27=100.10.27=27000\)
d)
\(28.64+28.36=28.\left(64+36\right)=28.100=2800\)
\(35x4=\left(25+15\right)x4=100+60\)\(=160\)
\(25x36=25x4x9=100x9=900\)
\(35\times4=140\)
\(25\times36=900\)
\(36\times12=432\)
\(75\times11=825\)
\(67\times101=6767\)
a ) 17 x 4 = ( 15 + 2 ) x 4 = 15 x 4 + 2 x 4 = 60 + 8 = 68
25 x 28 = 25 x ( 20 + 8 ) = 25 x 20 + 25 x 8 = 500 + 200 = 700
b ) 13 x 12 = 13 x ( 10 + 2 ) = 13 x 10 + 13 x 2 = 130 + 26 = 156
53 x 11 = 53 x ( 10 + 1 ) = 53 x 10 + 53 x 1 = 530 + 53 = 583
39 x 101 = 39 x ( 100 + 1 ) = 39 x 100 + 39 x 1 = 3900 + 39 = 3939
a) Ta có:
\(17\times4=\left(15+2\right)\times4=15\times4+2\times4=60+8=68\)
\(25\times28=25\times\left(20+8\right)=25\times20+25\times8=500+200=700\)
b) Ta có:
\(13\times12=13\times\left(10+2\right)=13\times10+13\times2=130+26=156\)
\(53\times11=53\times\left(10+1\right)=53\times10+53\times1=530+53=583\)
\(39\times101=39\times\left(100+1\right)=39\times100+39\times1=3900+39=3939\)
Dễ ợt à!
a/ 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
= ( 2. 12) . 31 + ( 4 . 6) . 42 + ( 8 . 3) . 27
= 24 . 31 + 24 . 42 + 24 . 27
= 24 . ( 31 + 42 + 27)
= 24 . 100
= 2400
b/ 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
= 36 . ( 28 + 82) + 64 . ( 69 + 41)
= 36 . 100 + 64 . 100
= 100 . ( 36 + 64)
= 100 . 100
= 10000
Dễ không bạn
a). 25.5.4.27.2=(25.4).(5.2).27=100.10.27=1000.27=27000
b). 28.64+28.36=28.(64+36)=28.100=2800
a/=36.(28+82)+64.(69+41)
=36.110+64.110=110.(36+64)=110.100=11000
Giúp mình với :v
tự đi mà làm