问题
解答题
计算下列各题(能简算要简算):
2100÷35+65×81
280+(280-280÷70)
(75+240)÷(20-5)
答案
(1)2100÷35+65×81,
=60+5265,
=5325;
(2)280+(280-280÷70),
=280+(280-4),
=280+276,
=556;
(3)(75+240)÷(20-5),
=315÷15,
=21.
计算下列各题(能简算要简算):
2100÷35+65×81
280+(280-280÷70)
(75+240)÷(20-5)
(1)2100÷35+65×81,
=60+5265,
=5325;
(2)280+(280-280÷70),
=280+(280-4),
=280+276,
=556;
(3)(75+240)÷(20-5),
=315÷15,
=21.