6.45*2.3+7.7怎样简便计算?

2025-04-03 19:56:31
推荐回答(2个)
回答1:

6.45*2.3+7.7
=6.45*2.3+10-2.3
=2.3*(6.45-1)+10
=2.3*5.45+10
=12.535+10
=22.535

回答2:

6.45*2.3+7.7
=6.45*(2+0.3)+7.7
=6.45*2+6.45*0.3+7.7
=12.9+1.935+7.7
=22.535