整式的化简求值 )① -3(2x²y-xy²)-(4xy²+3x²y) ②-3(
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整式的化简求值 )
① -3(2x²y-xy²)-(4xy²+3x²y) ②-3(2x²-xy)+4(x²+xy-6)
③2x-(x-y)+2(x+y)
化简求值
①(3a²-8a)+(2a³-13a²+2a)-2(a³-3) a=-2
② 8(a²-b)+4(a-b)+5(b-a)+8b² a= -1\2 b= -1\3
③ 3(2a²+5a-1)-4(3-8a-6a²) a= -1
④ 3(x²y-2xy²+x)-2(2x+5x²y-xy²) x= -1 y= -2
⑤已知A=2x²+4xy-2x-1 B= -x²+xy-1 当x= -1 y=2 求A-3B的值
⑥已知A=2x²+4xy-2x-3 B= -x²+xy+2 且3A+6B的值与x无关,求y的值
① -3(2x²y-xy²)-(4xy²+3x²y) ②-3(2x²-xy)+4(x²+xy-6)
③2x-(x-y)+2(x+y)
化简求值
①(3a²-8a)+(2a³-13a²+2a)-2(a³-3) a=-2
② 8(a²-b)+4(a-b)+5(b-a)+8b² a= -1\2 b= -1\3
③ 3(2a²+5a-1)-4(3-8a-6a²) a= -1
④ 3(x²y-2xy²+x)-2(2x+5x²y-xy²) x= -1 y= -2
⑤已知A=2x²+4xy-2x-1 B= -x²+xy-1 当x= -1 y=2 求A-3B的值
⑥已知A=2x²+4xy-2x-3 B= -x²+xy+2 且3A+6B的值与x无关,求y的值
-3(2x²y-xy²)-(4xy²+3x²y)
=-6x²y+3xy²-4xy²-3x²y 去括号 别忘记变号
=-9x²y-xy²
②-3(2x²-xy)+4(x²+xy-6)
=-6x²+3xy+4x²+4xy-24
=-2x²+7xy-24
③2x-(x-y)+2(x+y)
=2x-x+y+2x+2y
=3x+3y
你没有说要代什么值啊
再问: 再解答下把~谢了
再答: ①(3a2-8a)+(2a3-13a2+2a)-2(a3-3) a=-2 =3a2-8a+2a3-13a2+2a-2a3+6 =-10a2-6a+6 a=-2代入 -10x(-2)2-6x(-2)+6 =-10x4+12+6 =-40+12+6 =-22 ② 8(a2-b)+4(a-b)+5(b-a)+8b2 a= -1\2 b= -1\3 = 8a2-8b+4a-4b+5b-5a+8b2 =8a2-a+8b2 -7b a= -1\2 b=代入 8x( -1\2 )2-(-1\2)+8x(-1\3)2-7x(-1\3) =8x1/4+1/2+8x1/9+7/3 =2+1/2+8/9+21/9 =5/2+29/9 你急吗 题 不难 可是打起来有点累要不你加我的QQ953735784
再问: 就在上边打完呗!谢谢你了
再答: ③ 3(2a2+5a-1)-4(3-8a-6a2) a= -1 =6a2+15a-3-12+24a+24a2 =30a2+39a-15 a=-1代入 30x(-1)2+39x(-1)-15 =30-39-15 =-24 ④ 3(x2y-2xy2+x)-2(2x+5x2y-xy2) x= -1 y= -2 =3x2y-6xy2+3x-4x-10x2y+2xy2 =-7x2y-4xy2-x x= -1 y= -2 -7x(-1)2(-2)-4x( -1 )(-2)2-(-1) =14+16+1 =31 ⑤已知A=2x2+4xy-2x-1 B= -x2+xy-1 当x= -1 y=2 时,求A-3B的值
=-6x²y+3xy²-4xy²-3x²y 去括号 别忘记变号
=-9x²y-xy²
②-3(2x²-xy)+4(x²+xy-6)
=-6x²+3xy+4x²+4xy-24
=-2x²+7xy-24
③2x-(x-y)+2(x+y)
=2x-x+y+2x+2y
=3x+3y
你没有说要代什么值啊
再问: 再解答下把~谢了
再答: ①(3a2-8a)+(2a3-13a2+2a)-2(a3-3) a=-2 =3a2-8a+2a3-13a2+2a-2a3+6 =-10a2-6a+6 a=-2代入 -10x(-2)2-6x(-2)+6 =-10x4+12+6 =-40+12+6 =-22 ② 8(a2-b)+4(a-b)+5(b-a)+8b2 a= -1\2 b= -1\3 = 8a2-8b+4a-4b+5b-5a+8b2 =8a2-a+8b2 -7b a= -1\2 b=代入 8x( -1\2 )2-(-1\2)+8x(-1\3)2-7x(-1\3) =8x1/4+1/2+8x1/9+7/3 =2+1/2+8/9+21/9 =5/2+29/9 你急吗 题 不难 可是打起来有点累要不你加我的QQ953735784
再问: 就在上边打完呗!谢谢你了
再答: ③ 3(2a2+5a-1)-4(3-8a-6a2) a= -1 =6a2+15a-3-12+24a+24a2 =30a2+39a-15 a=-1代入 30x(-1)2+39x(-1)-15 =30-39-15 =-24 ④ 3(x2y-2xy2+x)-2(2x+5x2y-xy2) x= -1 y= -2 =3x2y-6xy2+3x-4x-10x2y+2xy2 =-7x2y-4xy2-x x= -1 y= -2 -7x(-1)2(-2)-4x( -1 )(-2)2-(-1) =14+16+1 =31 ⑤已知A=2x2+4xy-2x-1 B= -x2+xy-1 当x= -1 y=2 时,求A-3B的值
整式的化简求值 )① -3(2x²y-xy²)-(4xy²+3x²y) ②-3(
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