540÷45用四年级的运算定律怎么算?

问题描述:

540÷45用四年级的运算定律怎么算?

540÷45
=540÷(9×5)
=540÷9÷5
=60÷5
=12

拆45,拆成9和5
540÷45
=540÷(9×5)
=540÷9÷5
=60÷5
=12