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Nastya06032004
@Nastya06032004
November 2021
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Вычислите , используя формулу сокрашенного умножения :
47*33 2)43*37 3)84*76 4) 201*199 5) 105*95 6)398*402
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sedinalana
Verified answer
1
под формулу не подходит
(50-3)(30+3)=1500+150-90-9=1551
2
43*37=(40+3)(40-3)=1600-9=1591
3
84*76=(80+4)(80-4)=6400-16=6384
4
201*199=(200+1)(200-1)=40000-1=39999
5
105*95=(100+5)(100-5)=10000-25=9975
6
398*402=(400-2)(400+2)=160000-4=15996
3 votes
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Nastya06032004
Спасибо тебе огромное!!!
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Answers & Comments
Verified answer
1под формулу не подходит
(50-3)(30+3)=1500+150-90-9=1551
2
43*37=(40+3)(40-3)=1600-9=1591
3
84*76=(80+4)(80-4)=6400-16=6384
4
201*199=(200+1)(200-1)=40000-1=39999
5
105*95=(100+5)(100-5)=10000-25=9975
6
398*402=(400-2)(400+2)=160000-4=15996