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=2*2*51*7+2*2*7*43+2*2*7*6
=2*2*7*(51+43+6)
=28*100
=2800
Lưu ý: * là dấu nhân
Ok Chúc bạn học tốt
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4 . 51 . 7 + 2 . 86 . 7 + 2 . 7 . 12
= ( 4 . 51 ) . 7 + ( 2 . 86 ) . 7 + ( 2 . 12 ) . 7
= 204 . 7 + 172 . 7 + 24 . 7
= 7 . ( 204 + 172 + 24 )
= 7 . 400
= 2 800
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4.51.7+2.86.7+12.2.7
= 2.7.2.51+ 2.2.7.43+ 2.2.7.6
=2.2.7 .( 51+43+6)
= 28 . 100
= 2800
\(4.51.7+2.86.7+12.2.7=\left(4.51.7\right)+\left(2.86.7\right)+\left(12.2.7\right)=1428+1204+168=2632+168=2800\)
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=2.2.51.7+2.7.86+12.14
=2.51.14+14.86+14.12
=14.(102+86+12)
=14.202
=2828
\(4.51.7+2.86.7+12.2.7=2.7\left(2.51+86+12\right)=14\left(102+86+12\right)=14.200=2800\)
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4.51.7+2.86.7+2.2.7
=(4.7).51+(2.7.2).43+(2.2.7)
=28.51+28.43+28.1
=28.(51+43+1)
=28.95=2660
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41.36+59.90+41.81+59.30=11877
4.51.7+2.86.7+12.2.7=2800
x=1964
x=1500
![](https://rs.olm.vn/images/avt/0.png?1311)
a)41.36+59.89+41.84+59.11
=41.(84+36)+59.(11+89)
=41.120+59.100
=(41+59).(120+100)
=100.220=22000
b) 4.51.7+2.86.7+12.2.7
=2.2.51.7+(2.7).86+12.(2.7)
=102.(7.2)+14.86+12.14
=102.14+14.86+12.14
=14.(102+86+14)
=14.200=2800
a) 41.36 + 59.89 +41.84 +59.11= (41.56 + 41.84) + (59.89 + 59.11)= 41.(56+84) + 59.(89+11)= 41.100+ 59.100= 4100+5900=10 000
b) 4.51.7+2.86.7+12.2.7= 2.2.51.7+2.86.7+12.2.7=2.7(2.51+86+12)= 14.200=1800
c) 19.64+76.34= 19.64+19.4.34=19.(64+4.34)= 19.(64+136)= 19.200=3800
d) 35.12+65.13= 5.7.12+13.5.13= 5(7.12+13.13)=5.253=1265
e) 136.68+272.16= 136.17.4+136.2.4.4=136.4(17+2.4)= 136.4.25=136.100=13600
g) 19991999.1998-19981998.1999= 1999.10001.1998-1998.10001.1999=0
=2x7(2x51+86+12)
=14.(102+86+12)
=14.200
=2800
=2800 đó bn