вложение) пжл

вложение)
пжл

  • 1. a) sqrt{36b}-sqrt{16b}+2sqrt{b}=6sqrt{b}-4sqrt{b}+2sqrt{b}=4sqrt{b}

    b)sqrt{81b}-sqrt{25b}+3sqrt{b}=9sqrt{b}-5sqrt{b}+3sqrt{b}=7sqrt{b}

    2. a)(3sqrt{8}+sqrt{18})*sqrt{2}=3sqrt{16}+sqrt{36}=12+6=18

    б)(2a-sqrt{b})(2a+sqrt{b})=4a^{2}-b

    в)(sqrt{3}+sqrt{2})^2-sqrt{24}=3+2sqrt{6}+2-2sqrt{6}=5

    a)sqrt{3}*(2sqrt{12}+sqrt{48})=2sqrt{36}+sqrt{144}=12+12=24

    б)(sqrt{a}+3b)(sqrt{a}-3b)=a-9b^2

    в)(sqrt{5}-sqrt{2})^2+sqrt{40}=5-2sqrt{10}+2+2sqrt{10}=7

  • (36b)-(16b)+2b = 6b -4b +2b = 4b

    (81b)-(25b)+3b = 9b -5b + 3b = 7b

    (38+18)*2 = (3(2*4)+(9*2))*2 = (62 + 32)*2 = 6*2 + 3*2 = 12+6=18

    или так:

    (38+18)*2 =3(8*2)+(18*2) = 316 + 36 = 3*4 + 6 =12+6=18

    (2а-b)(2a+b)=4a-b

    (3 + 2) -24 = 3+26+2-26 = 3+2 = 5

    3(212+48)=236 +144 = 2*6+12 = 12+12 = 24

    (a+3b)(a-3b)=a-9b

    (5-2) +40=5-210+2+210 = 5+2 =7