1.Oblicz wartość liczbową wyrażenia ; 8a³-4a²+2 a= -¼
2.Oblicz [(x-4)*3+ x/2 ] *2:5
3.Wykonaj działanie ; 10a²b+(-2½a²b+½ab²)-(7,5a²b-ab²)
4.Doprowadź do najprostszej postaci ; 12x(0,5x²-¼y)-15y(-⅓x+0,2y²)-2xy=
/-kreska ułamkowa.
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1
8a³-4a²+2 a= -¼
8*(-1/4)^3-4*(-1/4)^2+2=-1/8-1/4+2=1i1/4
2
[(x-4)*3+ x/2 ] *2:5=
=(3x-12+1/2x)*2/5=
=(7/2x-12)*2/5=
=7/5x-24/5=
=1i2/5x-4i4/5
3
10a²b+(-2½a²b+½ab²)-(7,5a²b-ab²)=
=10a²b-2½a²b+½ab²-7,5a²b+ab²=
=1,5ab²
4
12x(0,5x²-¼y)-15y(-⅓x+0,2y²)-2xy=
=6x^3-3xy+5xy-3y^3-2xy=
=6x^3-3y^3