1.根号12乘根号6除根号24
=根号(12×6÷24)
=根号(3)
2. (2+根号3)(2-根号3)
=2²-(根号3)²
=4-3
=1
3. (根号5-2除根号5)^2
=5-4+4/5
=1+4/5
=9/5
即5分之9
4.根号下(-64)乘(-81)
=根号(64×81)
=根号(8²×9²)
=8×9
=72
1.根号12乘根号6除根号24
=根号(12×6÷24)
=根号(3)
2. (2+根号3)(2-根号3)
=2²-(根号3)²
=4-3
=1
3. (根号5-2除根号5)^2
=5-4+4/5
=1+4/5
=9/5
即5分之9
4.根号下(-64)乘(-81)
=根号(64×81)
=根号(8²×9²)
=8×9
=72