А) 1 7/8-1/4=1 7/8-2/8=1 5/8
б) 1 1/3 - 2/3=4/3-2/3=2/3
в) 4- 2 3/10=3 10/10 - 2 3/10=1 7/10
г) 7 1/6-3=4 1/6
д) 4 - 5/9+1 2/9=4 9/9-5/9+1 2/9=4 4/9+ 1 2/9=5 6/9=5 2/3
е) 2 - 2/3-1/2=2-4/6-3/6= 1 6/6-7/6=1 6/6-1 1/6=5/6
<span>2,81×12,1-(-4,8)×2,81=</span>47,489
A)
(-6Х*(5Х+5Х^4)-(5+20Х^3)
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(5Х+5Х^4)^2
б)
(1/cos√x)*(1/2√x)
Ответ:
a)(x-2)²=x²
x²-2*2х+2²-x²=0
4-4х=0
-4х=-4
х=-4:(-4)
х=1
б)(3y+5)²=9y²
9y² +2*5*3у+5²-9y² =0
30у+25=0
30у=-25
у= -25:30
у= -25\30= - 5\6= - 0,8(3)= -0,83
в)(c-7)²=c²-7
c²-2*7с+ 49-c²+7=0
-14с+56=0
-14с= -56
с= -56: (-14)
с=4
г)(6-z)²=z²+36
36-2*6z+z²-z²-36=0
-12z=0
z= 0: (-12)
z=0
д)(2x-1)²+2=0
4x²-2*2х+1+2=0
4x²-4х+3=0
D=b²-4ac=(-4)²-4*4*3=16-48= -32<0 - нет корней
е)3(x-2)²=3
3(x²-2*2х+4)=3
x²-4х+4=3:3
x²-4х+4=1
x²-4х+4-1=0
x²-4х+3=0
D=b²-4ac=(-4)²-4*1*3= 16-12=4
х1= -b+√D\2а=(4+√4):2=(4+2):2=6:2=3
x2= -b-√D\2а= (4- √4):2= (4-2):2=2:2=1
Пошаговое объяснение: