初二代数

显示全部楼层 · 2006-3-5 20:22:38

通分原式=[(3^2-12)+(2^2-3)]/(6+4倍根号3-3倍根号3-6)=-2/(根号3)=-(2/3)倍根号3

千问 · 2006-3-5 20:22:38

原式= [(3^2-12)+(2^2-3)]/(6+4倍根号3-3倍根号3-6) =-2/(根号3) =-(2/3)倍根号3

千问 · 2006-3-5 20:22:38

根号12=2倍根号3通分分子是9-12+4-3=-2
分母是(2-根号3)(3+2被根号3)=根号3-2/根号3=-2倍根号3/3

千问 · 2006-3-5 20:22:38

=（3-2根号3/2-根号3）+（2+根号3/3+2根号3）=[根号3（根号3-2/2-根号3）]+[2+根号3/根号3(根号3+2）]约分，=负根号3+1/根号3=负根号3+根号3/3=负2根号3/2