14Jan

Решите 3 задание, умоляю

sector33 Алгебра 1 0

Решите 3 задание, умоляю

Posted by sector33 | Posted at Jan 14, 2014 | Categories: Алгебра

Answers

mihan0087
mihan0087

#1 x=-1/2 y=-3 2*(-1/2)³-1/3*(-3)²=2*(-1/8)-1/3*9=-1/4-3=-3,25 #2 {3a-2b=14 {2a+b=7|*2 +{3a-2b=14 +{4a+2b=14 7a=28|:7 a=4 4*2+b=7 b=7-8 b=-1 #3 (3x+y)(2x-5y)-6(x-y)²=6x²-15xy+2xy-5y²-6(x²-2xy+y²)= 6x²-13xy-5y²-6x²+12xy-6y²=-11y²-xy (-2x³y)³*(-5x²y)²=-8x^9y³*25x⁴y²=-200x^13y^5 #4 ab+ac-a=a(b+c-1) 4x²-y²+2x-y=(4x²-y²)+(2x-y)=(2x-y)(2x+y)+(2x-y)=(2x-y)(2x+y) #5 V1-x V2-y {2x+y=28 {y=x+4 -{2x+y=28 -{-x+y=4 3x=24|:3 x=8 y=8+4 y=12

Jan 14, 2014 13:57

Leave a answer