简便计算:
12×5/11
=11×5/11+1×5/11
=5+5/11
=5又5/11
7.6×2又1/4+7又3/5×7又3/4
=38/5×9/4+38/5×31/4
=38/5×(9/4+31/4)
=38/5×10
=76