1)D=1-4×3×(-4)=1+48=49
2)D=(-0,2)^2 - 4×3×(-0,01)=0,04-(-0,12)=0,16
3)D=(-6)^2 - 4×7×(-45)=36+1260=1296
4)D=25-4×(-1)×1800=25+7200=7225
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1)D=1-4×3×(-4)=1+48=49
2)D=(-0,2)^2 - 4×3×(-0,01)=0,04-(-0,12)=0,16
3)D=(-6)^2 - 4×7×(-45)=36+1260=1296
4)D=25-4×(-1)×1800=25+7200=7225