脱式计算15x27-200
2016-12-21
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(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.
=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.
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