(3+2根2)(3-2根2)-(2根2-1)方

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(3+2根2)(3-2根2)-(2根2-1)方(3+2根2)(3-2根2)-(2根2-1)方(3+2根2)(3-2根2)-(2根2-1)方原式=3²-(2√2)²-(8+1-4√2

(3+2根2)(3-2根2)-(2根2-1)方
(3+2根2)(3-2根2)-(2根2-1)方

(3+2根2)(3-2根2)-(2根2-1)方
原式
=3²-(2√2)²-(8+1-4√2)
=9-8-9+4√2
=-8+4√2

原式
=3²-(2√2)²-(8+1-4√2)
=9-8-9+4√2
=-8+4√2

等于5减2跟2+1等于6+2跟2