II gimnazjum

Matematyka wokół nas 2

(x2−y2):2(x3+y3)2=2(x3+y3)2x2−y2​

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a−b+c1​1​=34941​ a−b+c1​1​=4−498​ a=4

5x3y−2x(x2y−x)−(3x3y−2x2)=5x3y−2x3y+2x2−3x3y+2x2=

Każdą liczbę dwucyfrową o liczbie dziesiątek a i liczbie jedności b można zapisać jako 10a+b (np. 46=4⋅10+6 )

Dzielimy figurę 2 pionowymi kreskami na trójkąt prostokąt oraz trapez.    P∇​=21​⋅3x⋅(8x+4−(4x+4))=21​⋅3x⋅(8x+4−4x−4)=21​⋅3x⋅4x=21​⋅12x2=6x2

długość boku po zwiększeniu: y+20%⋅y=y+10020​y=y+102​y=y+0,2y=1,2y

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