问题
解答题
脱式计算.
|
答案
(1)720÷(200-28×5)
=720÷(200-140)
=720÷60
=12;
(2)(15+27)×(55-32)
=42×23
=966;
(3)125+240÷15×12
=125+16×12
=125+192
=317;
(4)25×[(112+140)÷3]
=25×[252÷3]
=25×84
=2100.
脱式计算.
|
(1)720÷(200-28×5)
=720÷(200-140)
=720÷60
=12;
(2)(15+27)×(55-32)
=42×23
=966;
(3)125+240÷15×12
=125+16×12
=125+192
=317;
(4)25×[(112+140)÷3]
=25×[252÷3]
=25×84
=2100.