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2√7 < 7√2
√(2²*7) < √(7²*2)
√28 < √98
3√120=√(3²*120)=√(9*120)=√1080
2√270=√(2²*270)=√(4*270)=√1080
3√120=2√270
1/2*√6=√(1/4*6)=√(6/4)=√1,5
6√(1/2)=√(36*1/2)=√18
1/2√6<6√(1/2)
(х-3)(х+4)-(х-2)(х+3) =
=(х²+4х-3х-12) - (х²+3х-2х-6)=
= х²+х-12-х²-х+6=
= -12+6=-6
Sin²x-sinx=0
sinx(sinx-1)=0
sinx=0. sinx=1
x=Пn,n€z x=П/2+2Пn,n€z
А)5х+(3х-7)=9
5х+3х-7=9
8х=9+7
8х=16
х=16÷8
х=2.
б)3у-(5-у)=11
3у-5+у=11
3у+у=11+5
4у=16
у=16÷4
у=4.