28*7=196
<span>32-16=16
</span><span>16^4=4
</span><span>51:17=3
</span><span>90-68=22
</span><span>22*4=88
</span><span>196-4=192
</span><span>192+3=195
</span><span>195-14=181
</span><span>181+88=269
</span>
<span>2/7(2,6-1,9)=1.89. вот.</span>
9 1)
(75-84):0,2=-9:2/10=-9*10/2=-90/2=-45
2)
2.2:(-5-2.5)=22/10:(-7.5)=22/10:(-75/10)=22/10*(-10/75)=-22/75
ответ -22/75
= три целых три четвертых умножить на две целых две десятых= 10
<span>(х+1)*(x²-10х+25) = 7(х-5),
(х+1)(х-5)</span>² = 7(х-5),
(x+1)*(x-5)²-7(x-5) = 0,
(x-5)*((x+1)*(x-5)-7) = 0,
x-5 = 0,
x₁ = 5,
(x+1)*(x-5)-7 = 0,
x²-5x+х-5-7 = 0,
x²-4x-12 = 0,
D = (-4)² - 4*1*(-12) = 16 + 48 = 64,
x₂ = (4 + 8)/2*1 = 12/2 = 6,
x₃ = (4 - 8)/2*1 = -4/2 = -2.
Ответ: x₁ = 5 x₂ = 6 x₃ = -2.