Հանրահաշիվ Դասարանական աշխատանք

ա) (3a²b-5x)(7a-4bx²)=21a³b-12a²b²x²-35ax+20bx³=21×1×1×1-12×1×1×1-35×1×1+20×1×1×1=21-12-35+20=-6

բ) (2x²-3a)(4x-5ya³)=8x³-10x²ya³-12ax+15a⁴y=8×1×1×1-10×1×1-1×2×2×2-12×2×1+15×2×2×2×2-1=8-72-24+239=151

գ) (x³yz²-4xy³)(3x²y³-5xy²z³)=3x⁵y⁴z²-5x³y³z⁵-12x³y⁶+20x²y⁵z³=3×35×1×1-5×8

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