|5-2x|≤3
-3≤5-2x≤3
-8≤-2x≤-2
4≥x≥1
x∈[1..4]
Количество целых решений 4
На фото..........................
5x-3=0
5x=3
x=3/5
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2sin15° *(cos10° *cos5°-sin10° *sin5°)=2sin15° *cos(10°+5°)=
=2sin15° *cos15°=sin(2*15°)=sin30°=1/2=0,5
1) (1-b^2)(1+b^2+b^4)=1-b^3=1-(-2)^3=1-(-8)=1+8=9
2) 2x^3+7-(x+1)(x^2-x+1)2x^3+7-(x^3-1)=2x^3+7-x^3+1=x^3+8=(-1)^3+8=-1+8=7