早教吧 育儿知识 作业答案 考试题库 百科 知识分享

用简便法计算.0.89×1011.25×(8-0.8)2.7×4.3+5.7×2.76.18×9.9+0.6183.85-0.19-1.811.25×3.26×8

题目详情
用简便法计算.
0.89×101        1.25×(8-0.8)2.7×4.3+5.7×2.7
6.18×9.9+0.618     3.85-0.19-1.81     1.25×3.26×8
▼优质解答
答案和解析
(1)0.89×101
=0.89×(100+1)
=0.89×100+0.89
=89+0.89
=89.89

(2)1.25×(8-0.8)
=1.25×8-1.25×0.8
=10-1
=9

(3)2.7×4.3+5.7×2.7
=2.7×(4.3+5.7)
=2.7×10
=27

(4)6.18×9.9+0.618     
=6.18×9.9+0.1×6.18    
=6.18×(9.9+0.1)
=6.18×10
=61.8

(5)3.85-0.19-1.81
=3.85-(0.19+1.81)
=3.85-2
=1.85

(6)1.25×3.26×8
=1.25×8×3.26
=10×3.26
=32.6