‘壹’ 199999+19998+1997+196+10简便计算
你好,这道题的简便算法如下:
199999+19998+1997+196+10
=(199999+1)+(19998+2)+(1997+3)+(196+4)
=200000+20000+2000+200
=222200
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‘贰’ 19998+39996+49995+69996的简便算法是多少
19998+39996+50004+69996
=??????
‘叁’ 198+1998+19998 怎么样简便运算
198+1998+19998
=(200-2)+(2000-2)+(20000-2)
=22200-6
=22194
‘肆’ 用简便方法计算:99.8²(写出过程)
(100-0.2)²=100²-2×100×0.2+0.2²=10000-40+0.04=
‘伍’ 简便计算19998+1997+1969+9的方案加答案
19998+1997+1969+9
=20000-2 +2000-3 +2000-31+10-1
=2400 -(2+3+31+1)
=2400 -37
=2363
‘陆’ 19998+39996+49994+12最简便的方法是
19998+39996+49994+12最简便的方法是凑整法。
19998+39996+49994+12
=20000-2+40000-4+50000-6+12
=(20000+40000+50000)+(12-2-4-6)
=110000+0
=110000。
‘柒’ 简便计算:1999+999X998
解:
1999+999X998
=1999+(1000-1)x998
=1999+1000x998-998
=1999+998000-998
=999999-998
=999001
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‘捌’ 19998×32的简便算法是什么
19998x32
=(20000-2)X32
=20000X32-2X32
=640000-64
=639936
‘玖’ 199999+19998+196+10的简便方法
用 (200000-1)+(20000-2)+(200-4)+10
=200000+20000+200+10-(1+2+4)
=220210-7 =220203