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数学简便运算1.19.9*3.56+199*0.6442.1.1*1.1*9+1.1*1.1-10

题目详情
数学简便运算
1.
19.9*3.56+199*0.644
2.
1.1*1.1*9+1.1*1.1-10
▼优质解答
答案和解析
19.9*3.56+199*0.644
=199*0.356+199*0.644
=199*(0.356+0.644)
=199*1
=199
1.1*1.1*9+1.1*1.1-10
=1.1*1.1*(9+1)-10
=1.1*1.1*10-10
=(1.1*1.1-1)*10
=0.21*10
=2.1