2.84乘以(8.5-1.2)怎样简便计算

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2.84乘以(8.5-1.2)怎样简便计算2.84乘以(8.5-1.2)怎样简便计算2.84乘以(8.5-1.2)怎样简便计算2.84*(8.5-1.2)=2.84*7.3=2.84*(7+0.3)=

2.84乘以(8.5-1.2)怎样简便计算
2.84乘以(8.5-1.2)怎样简便计算

2.84乘以(8.5-1.2)怎样简便计算
2.84*(8.5-1.2)
=2.84*7.3
= 2.84*(7+0.3)
=2.84*7 +2.84*0.3
=19.88+0.852
= 20.732

20.732