2019小学二年级数学速算与巧算练习题(二十三)(2)
网络资源
2019-06-03 17:47:02
【答案】
解:197+198+196+199+195
=(200-3)+(200-2)+(200-4)+(200-1)+(200-5)
=200×5-(3+2+4+1+5)
=1000-15
=985
【答案】
解:197+198+196+199+195
=(200-3)+(200-2)+(200-4)+(200-1)+(200-5)
=200×5-(3+2+4+1+5)
=1000-15
=985