Question

5.6*69.32+138.64*0.05+693.2*0.43（简算）

Answer 1

5.6*69.32+138.64*0.05+693.2*0.43

=5.6*69.32*+69.32*2*0.05+69.32*10*0.43

=69.32*(5.6+2*0.05+10*0.43)

=69.32*10

=693.2