化简下列整式格式 (2a²b-5ab)-2(-ab-a²b)的化简过程等
问题描述:
化简下列整式格式 (2a²b-5ab)-2(-ab-a²b)的化简过程等
(2a²b-5ab)-2(-ab-a²b)的化简过程
1-3(x-1/2y²)+(-x+1/2y²)化简过程
(-x²y+3xy-4)+3(x²y-xy+2)化简过程
-1/4(2k³+4k²-28)+1/2(k³-2k²+4k)化简过程
3x²-(2x²+5x-1)-(3x+1) 其中x=10 化简过程ing.
(xy-3/2y-1/2)-(xy-3/2x+1)其中x=10/3 y=8/3
明天就要交给老师了
答
(2a²b-5ab)-2(-ab-a²b)=2a²b-5ab+2ab+2a²b=4a²b-3ab
1-3(x-1/2y²)+(-x+1/2y²)=1-3x+3/2y²-x+1/2y²=1-4x+2y²
(-x²y+3xy-4)+3(x²y-xy+2)=-x²y+3xy-4+3x²y-3xy+6=2x²y+2
-1/4(2k³+4k²-28)+1/2(k³-2k²+4k)=-1/2k³-k²+7+1/2k³-k²+2k=-2k²+2k+7
3x²-(2x²+5x-1)-(3x+1)=x²-5x+1-1-3x=x²-8x ,其中x=10,所以结果=100-80=20
(xy-3/2y-1/2)-(xy-3/2x+1)=xy-3/2y-1/2-xy+3/2x-1=3/2x-3/2y-3/2 ,其中x=10/3 y=8/3
所以结果=3/2(x-y-1)=3/2(10/3-8/3-1)=3/2(-1/3)=-1/2