Х+1,2 во второ
х+х+1,2=2х+1,2 в двух
1) 50*20=1000 ; 2) 15*8=120; 3) 7* 120=840 ; 4) 250*4=1000
<span>3,2*(12x-5,3x)=10,72
</span>3,2*(6,7x)=10,72
<span>21,44x=10,72
x=</span>10,72:21,44
x=0,5
Sina=1/3, sin^2a=1/9, 1-sin^2a=cos^2a, 1-(1/9)=8/9=cos^2a, cosa=(8/9)^(1/2), 4cosa=4((8/9)^(1/2))
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8/16=1/2=5/10, 4/5=8/10, 4/5 < 8/16
2/4=1/2=7/14, 3/7=6/14, 6/14 <7/14, 3/7 <2/4
2/8=1/4, 1/4=1/4, 2/8=1/4
5/5=1=9/9, 5/5 > 6/9
9/12=3/4=12/16, 12/16> 3/16, 9/12> 3/16
7/2=42/12, 42/12> 2/12, 7/2> 2/12
3/15=1/5, 4/5> 3/15