(1) 7-3x-4x2+4x-8x2-15 (2) 2(2a2-9b)-3(-4a2+b)
(3) 8x2-[-3x-(2x2-7x-5)+3]+4x (4)(5x-3y-2xy)-(6x+5y-2xy)
(5)3a2b-[2ab2-2(ab-1.5a2b)+ab]+3ab2
(6)
(7)(5x-3y-2xy)-(6x+5y-2xy)(8) 2(x+y)-3(x-y)-4(x+y)+5(x-y)-3(x-y)
(9)a+(a2-2a )-(a -2a2 ); (10)-3(2a+3b)-(6a-12b)
(11)9x2-[7(x2-y)-(x2-y)-1]-;
(12){ab-[ 3a2b-(4ab2+ab)-4a2b]}+3a2b.
(13)3(-3ab+2a)-(3a-b)+3ab
(14)2(x²-xy)-3(2x²-3xy)-2[x²-(2x²-xy+y²)]
(15)2a²- [ (ab-a²)+8ab]-ab
(16)2x³+4x-x²-4(x+3x²-2x³)
(17) a²b-5ac-(3a²c-a²b)+(3ac-4a²c)
(18) 4x²y-[6xy-3﹙4xy-2﹚-x²y]+1
(19)8a+2b+(5a-b) (20)(5a-3b)-3(a²-2b)
(21) x-2(x-y²)+3(-x+y²) (22)(-x²+5+4x)-2(5x-4+2x²)
(23)(3m²-2)+(m²-4m)-2(-m²-2m+1) (24)(2x+3y)+(5x+4y)
(25)3x²-4(2x²-2x)+2(3x-x²) (26)-m+3(2m-2)-5(3m+5)
(27)8a+2b-2(5a-b) (28)(5a-3b)-3(a²-2b)
(29)3a²-[7a-(4a-3)-2a²] (30) 3(a+abc)-(c²-3a)+c²
(31) x-3(x-y²)+6(-+y²) (32)2(x-3y)-3(y-2x)
(33).3(x3-2y3-3x2y)-2(3x3-3y3-7x2y)
(34)3a2-[5a-2(a-3)+2a2]+4 (35)3x2-[7x2-2(x2-3x)-2x]下载本文