0.1*√400 - 0.1=0.1*20 -0,1=2-0,1=1.9
(√2+1)²-2√2=(√2)²-2√2+1²-2√2=2+1=3
⁴√27 *(³√-4)³ *⁴√3 =⁴√(3³)* (-4¹/₃)³ *⁴√3=⁴√3⁴ *(-4)=3*(-4)=-12
∛2 *⁴√(-36)² ∛2 * ⁴√6⁴ ∛2 * 6
------------------ = ----------------------- = ----------- =2
∛54 ∛(2*27) 3*∛2
1/2*sin150*tg75=1/2*sin30*tg75=1/4*tg75=1/4*tg(45+30)=
=1/4*(tg45+tg30)/(1-tg75*tg30)=1/4*(1+1/√3)/(1-1/√3)=
=1/4*(√3+1)²/(√3-1)(√3+1)=1/4*(3+2√3+1)/(3-1)=1/4*(4+2√3)/2=
=1/4*2(2+√3)/2=(2+√3)/4
Объяснение:
(a-3b)/b=4
a-3b=4b
a=4b+3b=7b
a/b=7b/b=7
(4a+5b)/a=(4•7b+5b)/(7b)=(28b+5b)/(7b)=33b/(7b)=33/7=4 5/7