1)
(2t+4.3)(7t+8)=14t²+16t+30.1t+34.4=14t²+46.1t+34.4
2)
(-7-p)(m-4)=-7m+28-pm-4p
3)
(t+1)(t-7)-t²=t²-7t+t-7-t²=-6t-7
-6(-5)-7=30-7=23
4)
90z²+4=(5z+1)(18z+5)
90z²+4=90z²+25z+18z+5
4=25z+18z+5
4=43z+5
-43z=5-4
-43z=1
z=-(1/43)
5)
(0.1z+4s)(0.01z²-0.4zs+16s²)
0.001z³-0.16z²s+1.6zs²+0.04z²s-1.6zs²+64s³
0.001z³-0.12z²s+64s³
6)
(2u²+3)(3u-9)*u²=(6u³-18u²+9u-27)u²
6u^5-18u⁴+9u³-27u²
7)
(q-2)(7q+1)(4q-7)=(7q²+q-14q-2)(4q-7)
(7q²-13q-2)(4q-7)=28q³-49q²-52q²+91q-8q+14
28q³-101q²+83q+14
Х²+6х-10 ≥0 найдем нули D=6²-4*1*-10=36+40=76
x1=-6-√76)/2 x2=-6+√76)/2
______________________
+ -6-√76/2 - -6+√76/2 +
(-∞, ( -6-√76)/2] [(-6+√76)/2. ∞)- область определения
27^4 - 9^5 = (3^3)^4 - (3^2)^5 = 3^12 - 3^10 = 3^10 * (3^2 - 1) = 3^10 * 8