递等式计算,能简便的要简便方法计算
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12000÷(120-40×2)+20
=12000÷(120-80)+20
=12000÷40+20
=300+20
=320
25×11×24
=(25×4)×(11×6)
=100×66
=6600
101×99-99
=(101-1)×99
=100×99
=9900
11000÷125×8
=(11000×8)÷(125×8)×8
=88000÷1000×8
=88×8
=704
(54×21+45×21)÷33
=(54+45)×21÷33
=99×21÷33
=(99÷33)×21
=3×21
=63
335-287+265-113
=(335+265)-(287+113)
=600-400
=200
=12000÷(120-80)+20
=12000÷40+20
=300+20
=320
25×11×24
=(25×4)×(11×6)
=100×66
=6600
101×99-99
=(101-1)×99
=100×99
=9900
11000÷125×8
=(11000×8)÷(125×8)×8
=88000÷1000×8
=88×8
=704
(54×21+45×21)÷33
=(54+45)×21÷33
=99×21÷33
=(99÷33)×21
=3×21
=63
335-287+265-113
=(335+265)-(287+113)
=600-400
=200
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