15页:15×√14-6×√14 =( — )×√14=9√1419×√17×4×√17=( × )×( × )=76×17=( )( -11 )+(+16)+(-2/5)=+( - )+(-2/5)=(+5)+(2/5)=+( - )=+( )(-5)×(+4/5)+(-5)×(-4/5)=-(5
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