北师大三年级数学上册《买文具》练一练 5. 45÷5+14 9x7-30 45+15÷3 72÷9-8 20+6x6 15-48÷8

 北师大三年级数学上册《买文具》练一练

5.

45÷5+14

=9+14

=23

9x7-30

=63-30

=33

45+15÷3

=45+5

=50

72÷9-8

=8-8

=0

20+6x6

=20+36

=56

15-48÷8

=15-6

=9