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(4k2+7k)+(-k2+3k-1)(5y+3x-15z2)-(12y+7x+z2).(3k2+7k)+(4k2-3k+1)(3x2+2xy-1/2x)-(2x2-xy+x)(1/2xy+y2+1)+(x2-1/2xy-2y2-1)(m2-3m+2)-(4m-2n-1)-5(x2-3)-2(3x2+5)有60分
题目详情
(4k2+7k)+(-k2+3k-1)
(5y+3x-15z2)-(12y+7x+z2).
(3k2+7k)+(4k2-3k+1)
(3x2+2xy-1/2x)-(2x2-xy+x)
(1/2xy+y2+1)+(x2-1/2xy-2y2-1)
(m2-3m+2)-(4m-2n-1)
-5(x2-3)-2(3x2+5)
有60分
(5y+3x-15z2)-(12y+7x+z2).
(3k2+7k)+(4k2-3k+1)
(3x2+2xy-1/2x)-(2x2-xy+x)
(1/2xy+y2+1)+(x2-1/2xy-2y2-1)
(m2-3m+2)-(4m-2n-1)
-5(x2-3)-2(3x2+5)
有60分
▼优质解答
答案和解析
(4k2+7k)+(-k2+3k-1)=3k²+10k-1
(5y+3x-15z2)-(12y+7x+z2)=-7y-4x-16z²
.
(3k2+7k)+(4k2-3k+1)=7k²+4k+1
(3x2+2xy-1/2x)-(2x2-xy+x)=x²+3xy-3x/2
(1/2xy+y2+1)+(x2-1/2xy-2y2-1)=x²-y²
(m2-3m+2)-(4m-2n-1)=m²-7m+2n+3
-5(x2-3)-2(3x2+5)=-11x²+5
希望对你有所帮助
(5y+3x-15z2)-(12y+7x+z2)=-7y-4x-16z²
.
(3k2+7k)+(4k2-3k+1)=7k²+4k+1
(3x2+2xy-1/2x)-(2x2-xy+x)=x²+3xy-3x/2
(1/2xy+y2+1)+(x2-1/2xy-2y2-1)=x²-y²
(m2-3m+2)-(4m-2n-1)=m²-7m+2n+3
-5(x2-3)-2(3x2+5)=-11x²+5
希望对你有所帮助
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