3х - 4у = -6
(36*1.361)=49
1) 2 1/2 + 1 3/4 = 2 2/4 + 1 3/4 = 3 5/4 = 4 1/4
2) 6 2/3 + 4 4/5 = 6 10/15 + 4 12/15 = 10 22/15 = 11 7/15
3) 4 * 4 1/4 = 4 * 17/4 = 17
4) 11 7/15 : 2 = 172/15 * 1/2 = 86/15 = 5 11/15
5) 17 - 5 11/15 = 16 15/15 - 5 11/15 = 11 4/15
Решениееееееееееееееееееееееееееееееееее
A) 1/5√12 =√12 /(5√12*√12) =√12 /(5*12) =√(2*3*2) /60 =2√3 /60 =√3 /30
b) 3/(√12 -5) =3(√12+5) /(√12 -5)(√12+5) =3(√12+5) /(12 -25) = (-3√12 -3*5) /13 =(-3*2√3 -15) /13 =(-6√3 -15) /13