(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)...(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)+a平
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![(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)...(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)+a平](/uploads/image/z/2509604-44-4.jpg?t=%281%2F2%291%EF%BC%8E%E8%AE%BE%E6%A0%B9%E5%8F%B73%3Da%2C%E6%A0%B9%E5%8F%B730%3Db%2C%E5%88%99%E6%A0%B9%E5%8F%B70%EF%BC%8E9%3D%3F2%EF%BC%8E%E5%B7%B2%E7%9F%A5a-b%3D-%E6%A0%B9%E5%8F%B72%2Cab%3D1%2F3%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8F%E6%A0%B9%E5%8F%B7%EF%BC%88a%E5%B9%B3%E6%96%B9%2Bb%E5%B9%B3%E6%96%B9-2ab%29...%281%2F2%291%EF%BC%8E%E8%AE%BE%E6%A0%B9%E5%8F%B73%3Da%2C%E6%A0%B9%E5%8F%B730%3Db%2C%E5%88%99%E6%A0%B9%E5%8F%B70%EF%BC%8E9%3D%3F2%EF%BC%8E%E5%B7%B2%E7%9F%A5a-b%3D-%E6%A0%B9%E5%8F%B72%2Cab%3D1%2F3%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8F%E6%A0%B9%E5%8F%B7%EF%BC%88a%E5%B9%B3%E6%96%B9%2Bb%E5%B9%B3%E6%96%B9-2ab%29%2Ba%E5%B9%B3)
(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)...(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)+a平
(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)...
(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)+a平方
(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)...(1/2)1.设根号3=a,根号30=b,则根号0.9=?2.已知a-b=-根号2,ab=1/3,则代数式根号(a平方+b平方-2ab)+a平
1.
√3=a ,√30=b
√0.9=√(90/100)=√(3*30/100) = ab/10
2.
a-b= -√2,ab=1/3
(a²+b²-2ab)+a²+b²+ab
=2a²+2b²-2ab+ab
=2a²+2b²-4ab+3ab
=2(a-b)²+3ab
=2*2+3*1/3
=5
1.a=√3,b=√30 a^2=3,b^2=30 0.9=3^3/30=a^6/b^2
2.a-b=-√2,ab=1/3 √(a^2+b^2-2ab)+a^2=√(a-b)^2+a^2=|a-b|+a^2=√2+[(-3√2±√30)/6]^2
1.0.9=3*30/100=ab/100
所以根号0.9=根号ab/10
2.根号(a^2+b^2-2ab)+a^2中a^2在根号下吗?
则根号0.9=3/10a
则代数式根号(a平方+b平方-2ab)+a平方=5