脱式计算.(390+30)...

2023-01-06

【题目】脱式计算.

(390+30)÷7

340÷5÷2

205+675÷5.

 

【答案】(1)(390+30)÷7

=420÷7

=60

(2)340÷5÷2

=68÷2

=34

(3)205+675÷5

=205+125

=340

【解析】解:(1)(390+30)÷7

=420÷7

=60

(2)340÷5÷2

=68÷2

=34

(3)205+675÷5

=205+125

=340