(3根号7+2根号3)(2根号3-3根号7) 急急急!!!!!
计算:2)(根号32-3根号3)(4根号2+根号27)3)(3根号6-根号4)²4)(1+根号2-根号3)(1-根号2+根号3)...
计算:
2) (根号32-3根号3)(4根号2+根号27)
3) (3根号6-根号4)²
4) (1+根号2-根号3)(1-根号2+根号3) 展开
2) (根号32-3根号3)(4根号2+根号27)
3) (3根号6-根号4)²
4) (1+根号2-根号3)(1-根号2+根号3) 展开
1个回答
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1)(3根号7+2根号3)(2根号3-3根号7)
=(2根号3)²-(3根号 7)²
=12-63
=-51
2) (根号32-3根号3)(4根号2+根号27)
=(4根号2-3根号3)(4根号2+3根号3)
=(4根号2)²-(3根号3)²
=32-27
=5
3) (3根号6-根号4)²
=(3根号6-2)²
=(3根号6)²-12根号6+4
=54-12根号6+4
=58-12根号6
4) (1+根号2-根号3)(1-根号2+根号3)
=1-(根号2-根号3)²
=1-2+2根号6-3
=2根号6-5
=(2根号3)²-(3根号 7)²
=12-63
=-51
2) (根号32-3根号3)(4根号2+根号27)
=(4根号2-3根号3)(4根号2+3根号3)
=(4根号2)²-(3根号3)²
=32-27
=5
3) (3根号6-根号4)²
=(3根号6-2)²
=(3根号6)²-12根号6+4
=54-12根号6+4
=58-12根号6
4) (1+根号2-根号3)(1-根号2+根号3)
=1-(根号2-根号3)²
=1-2+2根号6-3
=2根号6-5
更多追问追答
追问
还有这道:(根号45+根号27)-(根号下3分之4+根号125)
追答
(根号45+根号27)-(根号下3分之4+根号125)
=3根号5+3根号3-2/3根号下3-5根号5
=7/3根号3-2根号5
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