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1、(1) (2x2-3xy+4y2)-2(x2+2xy-3y2);
(2) 2x+2y-[3x-2(x-y)];
(3) -2(3x+z)-(-6x-4z)+2(-5y+3z);
(4) 3a-(2a-4b-6c)+3(-2c+2b);
(5) 9a2-[7a2-2a-(-a2+3a+5)];
(6) ;
(7) (x2-2y2-z2)-3(-y2+3x2-z2)+(5x2+2z2)
(8) 2(2xy+y2-3)+(-x2+y2)-(x2+2xy+2-y2)
(9) 2(a2
2、-ab-b2)-3(4a-2b)+2(7a2-4ab+b2)
(10) 4x-2(x-3)-3[x-3(4-2x)+8];
(11) -(7x-y-2z)-{[4x-(x-y-z)-3x+z]-x};
(12) 2x2-{-3x-[4x2-(3x2-x)+(x-x2)]};
(13) 3x-2(2x-4y-6x)+3(-2z+2y);
(14) (3a2-4ab-5b2)-2(2b2-5a2-3)-(-6ab+2)
(15) (5a2b+3a2b2-ab2)-5(-2ab2+3a2b2+a2b)
3、
(16) -{2a2b-[3abc-(4ab2-a2b)]}
(17) 9a2+[7a2-2a-(-a2+3a)]
(18) 3a-(2a-3b)+3(a-2b)-b
(19) (-y+6+3y4-y3)-3(2y2-3y3+y4-7)
(20) -(2x2-y2)-3[2y2-(x2+2xy)]
(21) 2x-(x+3y)-5(-x-y)-2(x-y)
(22) (13x-11y+10z)-[15x-(15z-10y)]
4、
(23) 3x2y-5xy2-2(2x3-7x2y+6)-(4x3-xy2+10)
(24)
(25) [a-(b-c)]-2[-b-(-c-a)]
(26) (4x2-8x+5)-3(x3+3x2-6x+2)
(27) (3a6-a4+2a5-4a3-1)-2(2-a+a3-a5-a4)
(28) 2(-3x3+2x2-5x+1)-3(5-6x-x2+x3)
(29) 2m-{-3n+[-4m-(3m-n)]}
(30)
5、 4(x-y+z)-2(x+y-z)-3(-x-y-z)
(31) a3-(a2-a)+2(a2-a+1)-3(1-a4+a3)
(32)
(33)
(34) (5a2-2ab+3b2)-3[-2b2+(-ab-a2)]
(35) -2[b-2(-5a+3c)]-(-3b+5c)
(36) ( 2x2y+3xy2+2xy)-3[-(3x2y+2x2)-3xy-4]
(37) 4x2-[7x2-5x-3(1-2x+x2)]
(38) (x
6、3-2x2+x-4)-3( 2x3-5x+3)
(39) ( 3m4-m3-2m+5)-(-2m4-3m3-2m2-1)
(40)
(41) 3+(2x-y)-(y-x);
(42) x+2(3-x)-3(4x-1);
(43) a-2(a+b)+3(a-4b);
(44) 2x-(5a-7x-2a);
(45) 2(x-3)-(-x+4);
(46) ;
(47) 4x2-[6x-(2x-3)+2x2];
(48) -5a2-a2-(-7a2)+(
7、-3a2);
(49) 6a2b+5ab2-4ab2-7a2b;
(50) -3x2y+2x2y+3xy2-2xy2 ;
(51) ;
(52) -2(a2-3a)+(5a2-2a);
(53) 2x-(x+3y)-(-x-y)-(x-y);
(54) (2x4―5x2―4x+1)―(3x3―5x2―3x);
(55) ;
(56) (3x2-xy-2y2)—2(x2+xy—2 y2);
(57) ;
(58) (8xy-x2+y2)+(-y2+
8、x2-8xy);
(59) -ab+a2b+ab+(-a2b)-1;
(60) 3-2xy+2yx2+6xy-4x2y;
(61) (2x2-+3x)-4(x-x2+);
(62) x-2(x-y2)+(-x+y2);
(63) ;
(64) (x2-xy+y)-3(x2+xy-2y);
(65) 5(a2b-3ab2)-2(a2b-7ab);
(66) 3a2-9a+5-(-7a2+10a-5);
(67) (5x2y-7xy2)-(xy2-3x2y);
9、
(68) 3a2-9a+5-(-7a2+10a-5);
(69) -3a2b-(2ab2-a2b)-(2a2b+4ab2);
(70) -2(ab-3a2)-[2b2-(5ab+a2)+2ab];
(71) (a2+4ab-4b2)-3(a2+b2)-7(b2-ab);
(72) -3(2x2-xy)+4(x2+xy-6);
(73) -3x2y+2x2y+3xy2-2xy2;
(74) -[2m-3(m-n+1)-2]-1;
(75) x2y-3xy2+2yx2-y2x;
10、
(76) (2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3);
(77) 5x2-[3x-2(2x-3)+7x2];
(78) 2(x2y+xyz)-3(x2y-xyz)-4x2y;
(79) (5ab+4a+7b)+(6a-3ab)-(4ab-3b);
(80) 5ab2-[2a2b-(4ab2-2a2b)];
(81) 7-3x-4x2+4x-8x2-15;
(82) 2(2a2-9b)-3(-4a2+b);
(83) 8x2-[-3x-(2x2-7x-5)+3]+4x;
11、
(84) (5x-3y-2xy)-(6x+5y-2xy);
(85) 3a2b-[2ab2-2(ab-1.5a2b)+ab]+3ab2;
(86)
(87) ;
(88) ;
(89) ;
(90) ;
(91) ;
(92) ;
(93) ;
(94) ;
(95) ;
(96) ;
(97) ;
(98) ;
(99) ;
(100) .