.(-0.5)+3又4分之1+2.75+(-5又2分之1)要用简便计算
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.(-0.5)+3又4分之1+2.75+(-5又2分之1)要用简便计算.(-0.5)+3又4分之1+2.75+(-5又2分之1)要用简便计算.(-0.5)+3又4分之1+2.75+(-5又2分之1)要
.(-0.5)+3又4分之1+2.75+(-5又2分之1)要用简便计算
.(-0.5)+3又4分之1+2.75+(-5又2分之1)要用简便计算
.(-0.5)+3又4分之1+2.75+(-5又2分之1)要用简便计算
(-0.5)+3又4分之1+2.75+(-5又2分之1)
=(-0.5-5.5)+(3.25+2.75)
=-6+6
=0
(-0.5)+3(1/4)+2.75+(-5(1/2))
=(-0.5)+3.25+2.75+(-5.5)
=-(0.5+5.5)+(3.25+2.75)
=-6+6
=0
0,-0.5+3+0.25+2+0.75-5-0.5=0