1)10
2)1,75
3)10-1,75=8,25
4)3,93
2x²y+4xy²=2xy(x+2y)
100a-a³=a(100-a²)=a(10²-a²)=a(10-a)(10+a)
115. 116, 161, 611, 123, 132, 213, 231, 312, 321
118. а) 3/37, 3/73, 7/33, б) 3/3377, 3/3737, 3/3773, 3/7337, 3/7373, 3/7733, 7/3337, 7/3373, 7/3733, 7/7333, 33/377, 33/737, 33/773, 37/337, 37/373,
37/733, 73/337, 73/373, 73/733, 77/333.
119. 1/13, 2/13, 3/13, 4/13, 5/13, 6/13
sin+sinb=2*(sin(a+b)\2)*cos((a-b)\2)
sina=1 a=pi\2+2*pi*n
х<em>+2х=6+х
3х=6+х
3х-х=6
2х=6
х=6:2
х=3
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может как , то так
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