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22222×99999 = 22222×(100000-1) = 2222200000-22222 =222197778
(1234567890+98765432110)+99999
=100000000000+99999
=100000099999
1234567890+(99999+98765432110)=1234567890+98765432110+99999=100000000000+99999=100000099999
a) 485321 - 99999
= 485321 - (100000 - 1)
= 485321 - 100000 + 1
= 385321 + 1
= 385322
b) 7345 - 1998
= 7345 - (2000 - 2)
= 7345 - 2000 + 2
= 5345 + 2
= 5347
\(18\left(\frac{19191919}{21212121}+\frac{88888}{99999}\right)\)
\(=18\left(\frac{19}{21}+\frac{8}{9}\right)\)
\(=18\left(\frac{57}{63}+\frac{56}{63}\right)\)
\(=18\left(\frac{113}{63}\right)\)
\(=\frac{3^2.2.113}{3^2.7}\)
\(=\frac{226}{7}\)
\(=18x\left(\frac{19}{21}+\frac{8}{9}\right)\)
\(=18x\frac{113}{63}\)
\(=\frac{226}{7}\)
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
22222×99999
= 22222×(100000-1)
= 2222200000-22222
=222197778