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(1+√2)(1-√3)
=1-√3+√2-√6
(2-√5)²
=4-4√5+5
=9-4√5
(2√2-3√3)²
=8-12√6+27
=35-12√6
(7+√7)²-(7-√7)²
=49+14√7+7-49+14√7-7
=28√7
( 3√2+2√3)(2√3-3√2)
=6√6-18+12-6√6
=-6
=1-√3+√2-√6
(2-√5)²
=4-4√5+5
=9-4√5
(2√2-3√3)²
=8-12√6+27
=35-12√6
(7+√7)²-(7-√7)²
=49+14√7+7-49+14√7-7
=28√7
( 3√2+2√3)(2√3-3√2)
=6√6-18+12-6√6
=-6
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(1+√2)(1-√3)=1+√2-√3-√6
(2-√5)²=4-4√5+5=9-4√5
(2√2-3√3)²=(2√2)²-2(2√2)(3√3)+(3√3)²=8-12√6+27=35-12√6
(2-√5)²=4-4√5+5=9-4√5
(2√2-3√3)²=(2√2)²-2(2√2)(3√3)+(3√3)²=8-12√6+27=35-12√6
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(1+√2)(1-√3)
=1+√2-√3-√6
(2-√5)²
=4-4√5+5
=9-4√5
(2√2-3√3)²
=8-12√6+27
=35-12√6
=1+√2-√3-√6
(2-√5)²
=4-4√5+5
=9-4√5
(2√2-3√3)²
=8-12√6+27
=35-12√6
追问
(7+√7)²-(7-√7)²=
( 3√2+2√3)(2√3-3√2)=
谢谢了
追答
(7+√7)²-(7-√7)²
=49+14√7+7-49+14√7-7
=28√7
( 3√2+2√3)(2√3-3√2)
=6√6-18+12-6√6
=-6
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(1+√2)(1-√3)=1-√3+√2-√6;
(2-√5)²=4+5-4√5=9-4√5;
(2√2-3√3)²=8+27-12√6=35-12√6;
(2-√5)²=4+5-4√5=9-4√5;
(2√2-3√3)²=8+27-12√6=35-12√6;
追问
(7+√7)²-(7-√7)²=
( 3√2+2√3)(2√3-3√2)=
追答
(7+√7)²-(7-√7)²=(7+√7+7-√7)(7+√7-7+√7)=14*2√7=28√7;
( 3√2+2√3)(2√3-3√2)=12-18=-6;
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