10.1乘7.8怎样简便计算

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10.1乘7.8怎样简便计算
10.1乘7.8怎样简便计算

10.1乘7.8怎样简便计算
10.1X7.8=(10+0.1)X(8-0.2)=80+8-2-0.02=85.98

(10+0.1)*7.8=78+0.78

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

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