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www.40s8s.me:练习_二次根式的加减运算_图文

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练习: 1.下列计算是否正确?为什么? (1) 3 2= 5; (2) 5 2= 5 2; (3) 4 25= 4 25; (4) 36 12 = 18 6 . 2 解: (1)不正确. 3与 2不是同类项,不能直接相加. (2)不正确.应先计算被开方数. (3)不正确. 4与 25不是同类项,应计算后相加. (4)不正确.把2放入根式应为 4,而不是直接除以2. 2.将下列各式化成最简二次根式,然后求它们的和. 0.02,0.2,1 ,72,125,242 . 5 解: 0.02= 1 = 1 50 = 2 25 = 5 2 = 2 . 50 50 50 50 50 10 0.2= 1 = 5 = 5 . 5 25 5 1 = 1 5 = 5 . 5 5 5 5 72= 36 2=6 2 . 125= 25 5=5 5 . 242= 121 2=11 2 . 求和: 2 5 5 6 2 5 5 11 2 10 5 5 = 1 10 6 11 2 1 5 1 5 5 5 = 171 2 27 5 . 10 5 3.计算下列各式. (1)5 3 2 3 1;(2) 54 6 0.06 . 3 11 解: (1)5 3 2 3 1 3 =3 3 1 3 33 =3 3 3 3 = 10 3 . 3 (2) 54 6 0.06 11 = 9 6 611 6 1111 100 =3 6 66 6 11 10 = 31 6 66 . 10 11

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