问题
解答题
脱式计算.
85+79×85-79
78+(6500-140×41)
65+225÷(135-130)
答案
(1)85+79×85-79
=85×(1+79)-79
=85×80-79
=6800-79
=6721;
(2)78+(6500-140×41)
=78+(6500-5740)
=78+760
=838;
(3)65+225÷(135-130)
=65+225÷5
=65+45
=110.