Question

（1+0.23+0.34）×（0.23+0.34+0.45）-（1+0.23+0.34+0.45）×（0.23+0.34

Answer 1

(1+0.23+0.34)*(0.23+0.34+0.45)-(1+0.23+0.34+0.45)*(0.23+0.34)

令a=0.23+0.34

b=0.23+0.34+0.45

b-a=0.45

原式＝(1+a)*b-(1+b)*a

=b+ab-a-ab

=b-a

=0.45