№1
1) 7/9 - 2/3 = 7/9 - 6/9 = 1/9
2) 3 - 1 11/24 = 1целая 13/24
3) 1/9 + 1ц.13/24 = 8/72 + 111/72 = 119/72 = 1ц. 47/72
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№2
1) 3 7/30 + 2 11/12 = 5 + (7/30 + 11/12) = 5 + 14/60 + 55/60 = 5ц.69/60 = 6ц.9/60 = 6ц 3/20
2) 8 8/15 - 6 3/20 = 128/15 - 126/20 = 512/60 - 378/60 = 134/60 = 2 4/60 = 2 1/15
<span>1). 5(3-5a)^2-5(3a-7)(3a+7)=5(9-30a+25a²)×2-5(9a²-49)=2(45-150a+125a²)-45a²+245=90-300a+250a²-45a²+245=250a²+335-300a=250a²-300a+335
2). <span>(m-1)^2-4(m+1)^2-6(m+1)(m-1)=m²-2m+1-4(m²+2m+1)-6(m²+1)=m²-2m+1-4m²-8m-4-6m²-6=-9m²-10m-9=9m²+10m+9</span></span>
1) у=0,5х-11
у=0,5х-11, х€R
2) y=x+1\x-6 и график
1)tgx=0⇒x=πn
2)sin2x=-1/2⇒2x=(-1)^n+1 *π/6+πn⇒x=(-1)^n+1 *π/12+πn/2
3)tgx/4=1⇒x/4=π/4+πn⇒x=π+4πn
4)9cosx=sinx
9cos²x/2-9sin²x/2-2sin²/2cosx/2=0 /cos²x/2≠0
9tg²x/2+2tgx/2-9=0
tgx/2=a
9a²+2a-9=0
D=4+324=328 √D=2√82
a1=(-2-2√82)/18=-(1+√82)/9⇒tgx/2=-(1+√82)/9⇒x=-2arctg(1+√82)/9+πn
a2=(-2+2√82)/18=(-1+√82)/9⇒tgx/2=(-1+√82)/9⇒x=2arctg(-1+√82)/9+πn
<span>(13c-11d)*(13c+11d)=169c</span>²-121d²
(a-b)(a+b)=a²-b²