6.6×3.4+6.6×7.6-6.6=6.6X(3.4+7.6-1)=6.6X10=66
6.6×3.4+6.6×7.6-6.6=6.6×(3.4+7.6)-6.6=6.6×11-6.6答案不报
先乘除后加减
提取6.6