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怎样简便就怎样算780-456+2201456-56÷7×12325÷4÷25125×8883×26-15×83-83298×32299×31.

题目详情
怎样简便就怎样算
780-456+220                  1456-56÷7×12            325÷4÷25        125×88
83×26-15×83-83             298×32               299×31.
▼优质解答
答案和解析
(1)780-456+220                 
=780+220-456
=1000-456
=544;

(2)1456-56÷7×12
=1456-8×12
=1456-96
=1360;

(3)325÷4÷25       
=325÷(4×25)
=325÷100
=3.25;

(4)83×26-15×83-83 
=83×(26-15-1)
=83×10
=830;

(5)298×32
=(300-2)×32
=300×32-2×32
=9600-64
=9536;

(6)299×31
=(300-1)×31
=300×31-1×31
=9300-31
=9269.