10.1乘7.8怎样简便计算

2024-10-30 21:22:04
推荐回答(4个)
回答(1):

10.1X7.8=(10+0.1)X(8-0.2)=80+8-2-0.02=85.98

回答(2):

10.1X7.8
=(10+0.1)×7.8
=10×7.8+0.1×7.8
=78+0.78
=78.78

回答(3):

10.1*7.8=10*7.8+0.1*7.8=78+0.78=78.78

回答(4):

(10+0.1)*7.8=78+0.78