1.
<span>(-2,5+3/2/3):(-2/11/12)=(-25/10+11/3)
1.1.</span>
(-25/10+11/3)= <span>(-75+33)/30=-42/30=-7/5
1.2.(-7/5)*(-12/35)=12/25=0,48
2.</span>
(-1/1/3-3,5)×(-1/1/29)=(-4/3-35/10)·(-30/29)=(-4/3-7/2)·(-30/29)=
(-8-21)/6·)
(-30/29)=(29/6)·(30/29)=5
3.
<span>-2/2/3-х=1/1/9,(-8/3)-х=10/9, х=-8/3-10/9=-24-10/9=-34/9
х=-3 7/9( три целых семь девятых)</span>
1/2 ~ 0,08
7/45~ 0,15
3/11 ~ 0,27
1 целая 7/11~0,72
2/7~0,28
2cos3x=-√3
cos3x=√3/2
3x=_+ π/6 + 2πn
<u>x=_+π/18+2πn/3</u>
(х-87)-27=36
х-87=36+27
х-87=63
х=63+87
х=150
(150-87)-27=36
36=36
87-(41+у)=22
41+у=87-22
41+у=65
у=65-41
у=24
87-(41+24)=22
22=22