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22222×99999
= 22222×(100000-1)
= 2222200000-22222
=222197778
22222×99999 = 22222×(100000-1) = 2222200000-22222 =222197778
= (405 : 270 - 405 : 270) x 1234567890 + 2007
= 0 x 1234567890 + 2007
= 0 + 2007 = 2007
k mk nha
\(\left(40,5\div27-405\div270\right)\times1234567890+2007\)
\(=\text{ }\left[\left(40,5\times10\right)\div\left(27\times10\right)-405\div270\right]\times1234567890+2007\)
\(=\left(405\div270-405\div270\right)\times1234567890+2007\)
\(=0\times1234567890+2007\)
\(=0+2007\)
\(=2007\)
1234567890 + 987654321 + 24682468 + 1357913579 = 3604818258
bn k ch mk nha
a) 485321 - 99999
= 485321 - (100000 - 1)
= 485321 - 100000 + 1
= 385321 + 1
= 385322
b) 7345 - 1998
= 7345 - (2000 - 2)
= 7345 - 2000 + 2
= 5345 + 2
= 5347
a) 37 x 99999 = 37 x 100000 - 37 = 3700000 - 37 = 3699963
b) 45 x 10001 = 45 x 10000 + 45 = 450000 + 45 = 450045 .
c) 125125 x 72 = 125125 x 70 + 125125 x 2 = 87588750 + 250250 = 87839000
d) 252525 x 36 = 252525 x 30 + 252525 x 6 = 7575750 + 1515150 =9090900
a) 37581 - 9999 = 27582
b) 7345 - 1998 = 5347
c) 485321 - 99999 = 385322
d) 7593 - 1997 = 5596
37581-(10000-1)=27582
7345-(2000-2)=5347
485321-(100000-1)=385322
7593-(2000-3)=5596
(1234567890+98765432110)+99999
=100000000000+99999
=100000099999
1234567890+(99999+98765432110)=1234567890+98765432110+99999=100000000000+99999=100000099999