Question

Tính nhanh: 89 : 0,2 +89 + 89 :0,25

Answer 1

\(89:0,2+89+89:0,25=89\times5+89+89\times4=89\times\left(5+1+4\right)=89\times10=890\)

Answer 2

89:0.2  + 89 + 89 : 0.25 

=89.5+89.1+89.4

= 89. ( 5 + 1 + 4 )

= 89 .10

=890