<span>7,3x + 123,8 - (6,2 + 55,1)=7,3х+123,8-6,2-55,1=7,3х+62,5</span>
<span>при х=0,3 7,3*0,3+62,5=2,19+62,5=64,69</span>
1)2cos4x+√2=0
2cos4x=-√2
cos4x==-√2/2
a)4x=3π/4+2kπ, x=3π/16+kπ/2, k∈Z
b)4x=5π/4+2kπ,x=5π/16+kπ/2,k∈Z
(cos 135°=-√2/2, cos 225°=-√2/2)
2)y=2sin3xcos3x-5x²=sin6x-5x²
y´=6cos6x-10x
(2sinαcosα=sin2α)
<span>1 целая5/6=1,8
</span>
<span>2 целых3/8=2,375
</span>
<span>2/125=0,016
</span>
<span>5целых8/21=5,3
</span>
<span>9/20=0,45
</span>
<span>4/15=0,26
</span>
<span>3целых4/5=3,8
</span>
<span>61/600=0,1</span>