简便计算,
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简便计算,简便计算, 简便计算,0.45*6又11/25+3.56/(2又2/9)=0.45*(6+11/25)+3.56*9/20=0.45*(6+11/25+3.56)=0.45*(6+
简便计算,
简便计算,
简便计算,
0.45*6又11/25+3.56/(2又2/9)
=0.45*(6+11/25)+3.56*9/20
=0.45*(6+11/25+3.56)
=0.45*(6+0.44+3.56)
=0.45*10
=4.5 .
原式=0.45*161/25+3.56*9/20
=1.61*45/25+1.78*9/10
=1.61*9/5+0.89*9/5
=9/5(1.61+0.89)
=9/5*2.5
=4.5
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