Question

Tính nhanh :

a)19.64+76.34

b)136.68+16.272

c)(2+4+6+.......+100).(36.333-108.111)

Answer 1

a/ \(19.64+76.34\)

\(=19.4.16+19.4.34\)

\(=19.4\left(16+34\right)\)

\(19.4.50\)

\(=19.200=3800\)

b, \(136.68+16.272\)

\(=136.68+32.136\)

\(=136\left(68+32\right)\)

\(=136.100=13600\)

c/ \(\left(2+4+6+..........+100\right)\left(36.3.333-108.111\right)\)

\(=\left(2+4+....+100\right)\left(36.3.111-108.100\right)\)

\(=\left(2+4+.......+100\right)\left(108.111-108.111\right)\)

\(\left(2+4+...+100\right).0=0\)