- =
.
用简便方法计算 8.37﹣3.25﹣(1.37+2.25) 3.375÷5﹣× 9÷13+13÷9+11÷13+14÷9+6÷13 9966×6+6678×18 3762÷38+82917÷83
直接写出得数 += ﹣= 99×= ÷37= 999×222+333×334= (798×567+351)÷(798×568﹣447)=
求未知数x ①4x+7.1="12.5" ②x=0.6;③x:14%=:0.8.
简便计算.(1)(2)(3)562﹣552+542﹣532+…+22﹣12(4)(2007×2008×2009×2010+1)﹣(20082+2007)2.