Policzmy to razem zbiór zadań dla gimnazjum klasa 1 str. 77 ćwiczenie 55. Wykonaj mnożenie i zredukuj wyrazy podobne. a)(3x+2)(8+4y) b)(x²+3)(x-2) c)(4k-m)(4m-k) d)(-3p-2q)(7p+6q) e)(6s+10t)(0,5t+2,5s) f)(2/3z-t)(3/5t+1 i 1/2z)
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a][3x+2][8+4y]=24x+12xy+16+8y
b][x^+3][x-2]=xdo3-2x^+3x-6
c][4k-m][4m-k]=16km-4k^-4m^+km=17km-4k^-4m^
d][-3p-2g][7p+6g]=-21p^-18pg-14gp-12g^= -21p^-32pg-12g^
e][6s+10t][0,5t+2,5s]=3st+15s^+5t^+25ts=28st+15s^+5t^
f][2/3z-t][3/5t+1 1/2z]=[0,6z-t][0,6t+1,5z]=0,36zt+0,9z^-0,6t^-1,5zt= -1,14zt+0,9z^-0,6t^
a) ( 3x + 2 ) ( 8 + 4y ) =
= 24x + 12xy + 16 + 8y
b) ( x² + 3 ) ( x - 2 ) =
= x³ + 2x² + 3x - 6
c) ( 4k - m ) ( 4m - k ) =
= 16 km - 4k² - 4m² + mk =
= 17km - 4k² - 4m²
d) ( - 3p - 2q ) ( 7p + 6q ) =
= - 21p² - 18 pq - 14p² - 12q² =
= 6p² - 18pq - 12q²
e) ( 6s + 10t ) ( 0,5t + 2,5s ) =
= 3st + 15s² + 5t² + 25st =
= 28st + 15s² + 5t²
f) ( 2/3z - t ) ( 3/5t + 1 1/2z ) =
= 6/15tz + z² - 3/5t² - 1 1/2 tz =
= 12/30tz + z² - 3/5t² - 1 15/30tz =
= - 1 1/10tz + z² - 3/5t²
Mam nadzieje, że pomogłam...
Pozdrawiam...
I liczę na naj... :D