你会改吗?
4.5+8.1÷9×0.9 4.5÷(1.5×4)
=12.6÷9×0.9 =4.5÷1.5×4
=1.4×9 =3×4
=1.26 =12
下面题目正确吗?对的打“√”,错的打“×”不正确改正过来.