50道二元一次计算题带答案和50道二次根式的计算题,给不给力?

2个回答

  • 第三个链接共有8套卷子,每套都有若干计算题

    知道里整理的:

    ①5√8-2√32+√50

    =5*3√2-2*4√2+5√2

    =√2(15-8+5)

    =12√2

    ②√6-√3/2-√2/3

    =√6-√6/2-√6/3

    =√6/6

    ③(√45+√27)-(√4/3+√125)

    =(3√5+3√3)-(2√3/3+5√5)

    =-2√5+7√5/3

    ④(√4a-√50b)-2(√b/2+√9a)

    =(2√a-5√2b)-2(√2b/2+3√a)

    =-4√a-6√2b

    ⑤√4x*(√3x/2-√x/6)

    =2√x(√6x/2-√6x/6)

    =2√x*(√6x/3)

    =2/3*|x|*√6

    ⑥(x√y-y√x)÷√xy

    =x√y÷√xy-y√x÷√xy

    =√x-√y

    ⑦(3√7+2√3)(2√3-3√7)

    =(2√3)^2-(3√7)^2

    =12-63

    =-51

    ⑧(√32-3√3)(4√2+√27)

    =(4√2-3√3)(4√2+3√3)

    =(4√2)^2-(3√3)^2

    =32-27

    =5

    ⑨(3√6-√4)?

    =(3√6)^2-2*3√6*√4+(√4)^2

    =54-12√6+4

    =58-12√6

    ⑩(1+√2-√3)(1-√2+√3)

    =[1+(√2-√3)][1-(√2-√3)]

    =1-(√2-√3)^2

    =1-(2+3+2√6)

    =-4-2√6

    (1)5√12×√18

    =5*2√3*3√2

    =30√6;

    (2)-6√45×(-4√48)

    =6*3√5*4*4√3

    =288√15;

    (3)√(12a)×√(3a) /4

    =√(36a^2)/4

    =6a/4

    =3a/2.

    2.9x+4y=35

    8x+3y=30

    3.7x+2y=52

    7x+4y=62

    4.4x+6y=54

    9x+2y=87

    5.2x+y=7

    2x+5y=19

    6.x+2y=21

    3x+5y=56

    7.5x+7y=52

    5x+2y=22

    8.5x+5y=65

    7x+7y=203

    9.8x+4y=56

    x+4y=21

    10.5x+7y=41

    5x+8y=44

    11.7x+5y=54

    3x+4y=38

    12.x+8y=15

    4x+y=29

    13.3x+6y=24

    9x+5y=46

    14.9x+2y=62

    4x+3y=36

    15.9x+4y=46

    7x+4y=42

    16.9x+7y=135

    4x+y=41

    17.3x+8y=51

    x+6y=27

    18.9x+3y=99

    4x+7y=95

    19.9x+2y=38

    3x+6y=18

    应该够了·····