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Efectuati:a)4x²-5x²-7x²+9x²=
b)√18x-√32x+√50x=
c)18-(7x-9)+(23x-21)=
d)(7x³)*5x^4=
e)3 1
---x²*2---xy*(-2xy²)=
7 3
f)54a³b³:(-6a²b)=


Răspuns :

[tex]a) {4x}^{2} - {5x}^{2} - {7x}^{2} + {9x}^{2} = {x}^{2} [/tex]

[tex]b) \sqrt{18} x - \sqrt{32} x + \sqrt{50} x[/tex]

[tex] = 3 \sqrt{2} x - 4 \sqrt{2} x + 5 \sqrt{2} x[/tex]

[tex] = 4 \sqrt{2} x[/tex]

[tex]c)18 - (7x - 9) + (23x - 21)[/tex]

[tex] = 18 - 7x + 9 + 23x - 21[/tex]

[tex] = 16x + 6[/tex]

[tex] = 2(8x + 3)[/tex]

[tex]f)54 {a}^{3} {b}^{3} \div ( - 6 {a}^{2} b) = - 9a {b}^{2} [/tex]