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-5a - 2b(a-b)=-5a-2ab+2b²
-5×¾-2×¾×2+2×2²=-15/4-3+8=5/4
a = trzy czwarte , b = 2
-5*3/4 -2*3/4*2+2*2*2=-5i3/4 - 2i3/4+8=-8i1/4 +8=1/4
-5a - 2b(a-b)=-5a-2ab+2b²
-5×3\4-2 3\4×2+2×2²=-15/4-3+8=5\4