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Girl090323
@Girl090323
July 2022
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Ellenochka
1. a) (m+2n)(k-p) = mk-mp+2nk-2np ;
б) (3x-y)(2z+1) = 6xz+3x-2yz-y ;
в) (5a-2)(3b-1) = 15ab-5a-6b+2 ;
г) (a²+4)(a-1) = a³-a²+4a-4 .
2. a) (x-2)(3x-1) = 3x² - 7x + 2 ;
б) (3x+3y)(2x-5y) = 6x² - 15xy + 6xy -15y² = 6x² - 9xy -15y² ;
в) (2c²-3)(3-5c²) = 6c² - 10c⁴ - 9 +15c² = -10c⁴ + 21c² - 9 ;
г) (2z+xy)(2z-xy) = 2z² - x²y² .
3. a) (2x+3)(5x-1) + (x-1)(6x+5) =10x²+15x-2x-3+6x²-6x+5x-5 = 16x²+12x-8;
б) (3t-2v)(5t+7v)-(2t+v)(t-14v) =15t²+11tv-14v²-2t²+27tv+14v²= 13t² + 38tv;
4. (7t+5)(12t-2)=(14t+1)(6t+11)
84t²+60t-14t-10=84t²+6t+154t+11
114t = -21
5. (2v-1)(5v+6) = (v-2)(v+3)
10v²+7v-6 = v²+v-6
9v²+6v=0
3v(3v+2)=0
3v=0 3v+2=0
6. x(x+2)=x²+48
x²+2x-x²=48
2x=48
x=24 меньшее
24+2=26 - большее из двух последовательных четных натур.чисел
2 votes
Thanks 2
Girl090323
Спасибо, огромное!
Ellenochka
пожалуйста)
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Answers & Comments
б) (3x-y)(2z+1) = 6xz+3x-2yz-y ;
в) (5a-2)(3b-1) = 15ab-5a-6b+2 ;
г) (a²+4)(a-1) = a³-a²+4a-4 .
2. a) (x-2)(3x-1) = 3x² - 7x + 2 ;
б) (3x+3y)(2x-5y) = 6x² - 15xy + 6xy -15y² = 6x² - 9xy -15y² ;
в) (2c²-3)(3-5c²) = 6c² - 10c⁴ - 9 +15c² = -10c⁴ + 21c² - 9 ;
г) (2z+xy)(2z-xy) = 2z² - x²y² .
3. a) (2x+3)(5x-1) + (x-1)(6x+5) =10x²+15x-2x-3+6x²-6x+5x-5 = 16x²+12x-8;
б) (3t-2v)(5t+7v)-(2t+v)(t-14v) =15t²+11tv-14v²-2t²+27tv+14v²= 13t² + 38tv;
4. (7t+5)(12t-2)=(14t+1)(6t+11)
84t²+60t-14t-10=84t²+6t+154t+11
114t = -21
5. (2v-1)(5v+6) = (v-2)(v+3)
10v²+7v-6 = v²+v-6
9v²+6v=0
3v(3v+2)=0
3v=0 3v+2=0
6. x(x+2)=x²+48
x²+2x-x²=48
2x=48
x=24 меньшее
24+2=26 - большее из двух последовательных четных натур.чисел