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用递等式计算,能简便的用简便方法计算.219-31+381-119560÷16+40×24490-[210÷(360÷12)]69×120+1205600÷25÷4125×32×25
题目详情
用递等式计算,能简便的用简便方法计算.
219-31+381-119 | 560÷16+40×24 | 490-[210÷(360÷12)] |
69×120+120 | 5600÷25÷4 | 125×32×25 |
▼优质解答
答案和解析
(1)219-31+381-119
=(219+381)-(31+119)
=600-150
=450;
(2)560÷16+40×24
=35+960
=995;
(3)490-[210÷(360÷12)]
=490-[210÷30]
=490-7
=483;
(4)69×120+120
=(69+1)×120
=70×120
=8400;
(5)5600÷25÷4
=5600÷(25×4)
=5600÷100
=56;
(6)125×32×25
=125×(4×8)×25
=(125×8)×(4×25)
=1000×100
=100000.
=(219+381)-(31+119)
=600-150
=450;
(2)560÷16+40×24
=35+960
=995;
(3)490-[210÷(360÷12)]
=490-[210÷30]
=490-7
=483;
(4)69×120+120
=(69+1)×120
=70×120
=8400;
(5)5600÷25÷4
=5600÷(25×4)
=5600÷100
=56;
(6)125×32×25
=125×(4×8)×25
=(125×8)×(4×25)
=1000×100
=100000.
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