вычислите используя формулу разности квадратов :
б)29х31
в)61х59
г)99х101
д)18х22
е)48х52
б)29х31
в)61х59
г)99х101
д)18х22
е)48х52
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Answers & Comments
в) (60-1)(60+1) = (60²-1²) = 3600-1 = 3599
г) (100-1)(100+1) = (100²-1²) = 10000 - 1 = 9999
д) (20-2)(20+2) = (20²-2²) = 400-4 = 396
е) (50-2)(50+2) = (50²-2²) = 2500-4 = 2496