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脱式计算,能简算的要简算(1)678+57+243-178(2)659-(236-59+174)(3)24×2×125×25(4)45×12+12×58-3×3×4(5)16×25(6)720÷8÷9(7)1280-13×(3591÷57)(8)3840÷[(200-192)×8]

题目详情
脱式计算,能简算的要简算
(1)678+57+243-178
(2)659-(236-59+174)(3)24×2×125×25        
(4)45×12+12×58-3×3×4(5)16×25                 (6)720÷8÷9
(7)1280-13×(3591÷57)(8)3840÷[(200-192)×8].
▼优质解答
答案和解析
(1)678+57+243-178
=(678-178)+(57+243)
=500+300
=800;

(2)659-(236-59+174)
=659+59-(236+174)
=718-410
=308;

(3)24×2×125×25
=3×(8×125)×(2×25)
=3×1000×50
=150000;

(4)45×12+12×58-3×3×4
=(45+58-3)×12
=100×12
=1200;


(5)16×25
=(4×25)×4
=100×4
=400;

(6)720÷8÷9
=720÷(8×9)
=720÷72
=10;


(7)1280-13×(3591÷57)
=1280-13×63
=1280-819
=461;

(8)3840÷[(200-192)×8]
=3840÷(8×8)
=3840÷64
=60.