Question

1.tính nhanh

a) 2.53.12+4.6.87-3.8.40

b) 5.7.77-7.60+49.25-45.42 

( "."= nhân)

mik cần gấp ạ

Answer 1

a: \(2\cdot53\cdot12+4\cdot6\cdot87-3\cdot8\cdot40\)

\(=24\left(53+87-40\right)\)

=2400

b: \(5\cdot7\cdot77+7\cdot60+49\cdot25-45\cdot42\)

\(=35\cdot77+35\cdot12+49\cdot25-45\cdot42\)

\(=35\cdot89+35\left(7\cdot5-9\cdot6\right)\)

\(=35\cdot70=2450\)

Answer 2

a) 2.53.12+4.6.87-3.8.40

=24.53+24.87-24.40

=24.(53+87-40)

=24.100

=2400

b) 5.7.77-7.60+49.25-45.42

=5.7.77-7.60+7.7.25-45.6.7

=7.(5.77-60+7.25-6.45)

=7.230

=1610