Ответ:
3) -1x(15xy)
Объяснение:
так сказал наш отличник
3)2xy(2x²-5xy)-3xy(7xy-y²)
xy(2(2x²-5xy)-3(7xy-y²))
xy(4x²-10xy-21xy+3y²)
xy(4x²-31xy+3y²)
Или:
2xy(2x²-5xy)-3xy(7xy-y²)
4x³y-10x²y²-21x²y²+3xy³
4x³y-31x²y²+3xy³
4)6m²-5m(2n-m)-4m(3m+2,5n)
6m²-10mn+5m²-12m²-10mn
-m²-20mn
6m²-5m(2n-m)-4m(3m+2,5n)
6m²-5m(2n-m)-4m(3m+5/2n)
m(6m-5(2n-m)-4(3m+5/2n))
m(6m-10n+5m-12m-10n)
m(-m-20n)
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Answers & Comments
Ответ:
3) -1x(15xy)
Объяснение:
так сказал наш отличник
Ответ:
3)2xy(2x²-5xy)-3xy(7xy-y²)
xy(2(2x²-5xy)-3(7xy-y²))
xy(4x²-10xy-21xy+3y²)
xy(4x²-31xy+3y²)
Или:
2xy(2x²-5xy)-3xy(7xy-y²)
4x³y-10x²y²-21x²y²+3xy³
4x³y-31x²y²+3xy³
4)6m²-5m(2n-m)-4m(3m+2,5n)
6m²-10mn+5m²-12m²-10mn
-m²-20mn
Или:
6m²-5m(2n-m)-4m(3m+2,5n)
6m²-5m(2n-m)-4m(3m+5/2n)
m(6m-5(2n-m)-4(3m+5/2n))
m(6m-10n+5m-12m-10n)
m(-m-20n)