Tính Nhanh a) 19.64 + 76. 34 b) 35.15 + 65.13 c) 136.68 + 16.272 d) (2+4+6+8+….+100).( 36.333-108.111) e) 19991999.1998 -19981998.1999 Mấy SuperHero

Đáp án:

a,19.64+76.34=19.76+64.34=1444+2176=3620

b,35.15+65.13=525+845=1370

c,136.68 + 16.272=136.68+16.2.136=136.(68+16).2=136.74.2=20128

d) (2+4+6+8+….+100).( 36.333-108.111)

=(2+4+6+…+100).(36.111.3-108.111)

=(2+4+6+…+100).[(36.3).111-108.111]

=(2+4+6+…+100).[108.111-108.111]

=(2+4+6+8+….+100).[11988-11988]

= (2+4+6+8+….+100).0

=0

e,19991999.1998 -19981998.1999

=(10001.1999).1998-(10001.1998).1999

=1999.1998-1998.1999

=0

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