Question

Answer 1

\(a.21.54+21.46+\left(-2000\right)\\ =21.\left(54+46\right)+\left(-2000\right)\\ =21.100+\left(-2000\right)\\ =2100+\left(-2000\right)\\ =100\)

\(c.81.6^2+81.64\\ =81.36+81.64\\ =81.\left(36+64\right)\\ =81.100\\ =8100\)

Answer 2

=21.(54+46)+(-2000)
=21.100+(-2000)
=2100+(-2000)
=100(chắc thế :)))) )

 

Answer 3

a) 21.54 + 21.46 + (-2000)

= [21.(54+46)] + (-2000)

=[21.100] + (-2000)

=2100 + (-2000)

=100

c) 81.6² + 81.64

= 81.36 + 81.64

=81. (36 + 64)

=81. 100

=8100

nếu sai mong bạn thông cảm