P = 3x ²y – 2x + 5xy ² – 7y ² và Q = 3x ²y – 7y ² – 9x ²y – x – 5 Tìm đa thức M bt A, M = P + Q B, M = Q – P 16/07/2021 Bởi Ivy P = 3x ²y – 2x + 5xy ² – 7y ² và Q = 3x ²y – 7y ² – 9x ²y – x – 5 Tìm đa thức M bt A, M = P + Q B, M = Q – P
Bạn tham khảo nhé A, M = P + Q = 3x²y – 2x + 5xy² – 7y² + 3x²y – 7y² – 9x²y – x – 5 = -3x²y – 3x + 5xy² – 14y² – 5 B, M = Q – P = 3x²y – 7y² – 9x²y – x – 5 – (3x²y – 2x + 5xy² – 7y²) = 3x²y – 7y² – 9x²y – x – 5 – 3x²y + 2x – 5xy² + 7y² = -9x²y + x – 5 – 5xy² Bình luận
a, M=3x²y-2x+5xy²-7y²+3x²y-7y²-9x²y-x-5 ⇒M=(3x²y+3x²y-9x²y)+(-2x-x)+5xy²+(-7y²-7y²)-5 ⇒M=-3x²y-3x+5xy²-14y²-5 b, M=3x²y-7y²-9x²y-x-5-(3x²y-2x+5xy²-7y²) ⇒M=3x²y-7y²-9x²y-x-5-3x²y+2x-5xy²+7y² ⇒M=(3x²y-3x²y-9x²y)+(2x-x)-5xy²+(-7y²+7y²)-5 ⇒M=-9x²y+x-5xy²-5 Bình luận
Bạn tham khảo nhé
A, M = P + Q
= 3x²y – 2x + 5xy² – 7y² + 3x²y – 7y² – 9x²y – x – 5
= -3x²y – 3x + 5xy² – 14y² – 5
B, M = Q – P
= 3x²y – 7y² – 9x²y – x – 5 – (3x²y – 2x + 5xy² – 7y²)
= 3x²y – 7y² – 9x²y – x – 5 – 3x²y + 2x – 5xy² + 7y²
= -9x²y + x – 5 – 5xy²
a, M=3x²y-2x+5xy²-7y²+3x²y-7y²-9x²y-x-5
⇒M=(3x²y+3x²y-9x²y)+(-2x-x)+5xy²+(-7y²-7y²)-5
⇒M=-3x²y-3x+5xy²-14y²-5
b, M=3x²y-7y²-9x²y-x-5-(3x²y-2x+5xy²-7y²)
⇒M=3x²y-7y²-9x²y-x-5-3x²y+2x-5xy²+7y²
⇒M=(3x²y-3x²y-9x²y)+(2x-x)-5xy²+(-7y²+7y²)-5
⇒M=-9x²y+x-5xy²-5