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计算,能用简便计算的用简便方法计算.4.65-2.55-1.456.4÷(0.3×2+0.2)201×6.5-6.57.2×0.25+2.8×0.25.

题目详情
计算,能用简便计算的用简便方法计算.
4.65-2.55-1.45
6.4÷(0.3×2+0.2)
201×6.5-6.5
7.2×0.25+2.8×0.25.
▼优质解答
答案和解析
①4.65-2.55-1.45=4.65-(2.55+1.45)=4.65-4=0.65②6.4÷(0.3×2+0.2)=6.4÷(0.6+0.2)=6.4÷0.8=8③201×6.5-6.5=(201-1)×6.5=200×6.5=1300④7.2×0.25+2.8×0.25=(7.2+2.8)×0.25=10×0.25=2.5...