问题
解答题
|
答案
(1)315-135÷9,
=315-15,
=300;
(2)105-13×6+57,
=105-78+57,
=27+57,
=84;
(3)(45+240)÷(20-5),
=285÷15,
=19.
|
(1)315-135÷9,
=315-15,
=300;
(2)105-13×6+57,
=105-78+57,
=27+57,
=84;
(3)(45+240)÷(20-5),
=285÷15,
=19.