Question

19.94+99.7*99.8怎样简便运算

Answer 1

19.94+99.7*99.8
=20-0.06+(100-0.3)(100-0.2)
=20-0.06+100*100-0.5*100+0.06
=20+10000+50
=1070

Answer 2

=99.7*0.2 + 99.7*99.8
=99.7*100