<span>Найдите значение выражения</span> <span>при m= 2/15; n=-2</span>
15mn-2n+15m²-2m=15m(n+m)-2(n+m)=(n+m)(15m-2) =(-2+2/15)(15*2/15-2)=(-28/15)(2-2)=0
<span>5*5/9 - 1/2* 5/9 - 1/3 * 5 + 1/2*1/3=5/9(5-1/2)-1/3(5-1/2)=(5-1/2)(5/9-1/3)=9/2*2/9=1</span>
1
<span>а) √48-2√3 (2-5√12)=4√3-4√3+10√36=10*6=60
б) (3+√3)(2+√3)=6+3√3+2√3+3=9+5√3
2</span>
<span>а) (3+√a )/ (3√a+a)=(3+√а)/√а(3+√а)=1/√а
б) (√2-2) / (√2-1)=-√2(√2-1)/(√2-1)=-√2
в) (2√7-7 )/ √7
=√7(2-√7)/√7=2-√7</span>
а) -0,28*4/7+5\7:2 6/7 = -28/100 * 4/7 + 5/7÷26/7 = - 4/25 + 5/26 =-104+ 125 / 650 = 21/ 600 = 7/300
б) 5/6*(-0,3) - 4/5:1 1/15 = 5/6 * (-3/10) - 4/5 ÷ 11/15 = -1/ 4 - 12/11 = -11- 48 / 44 = -59/44 = - 1 целая 15/44
