人教版七年级上册整数加减去括号练习题100道要有解题步骤 求七年级上册的有价值的数学题!就是整式加减去括号的！难度适中...

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2006*(1-1/2)(1-1/3)(1-1/4)...(1-1/2005)(1-1/2006)
=2006*(1/2)(2/3)(3/4)...(2004/2005)(2005/2006)
=2006*(1/2006)
=1
[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)
5+21*8/2-6-59
68/21-8-11*8+61
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4*(-0.4)]/1/3+2
22+(-4)+(-2)+4*3
-2*8-8*1/2+8/1/8
(2/3+1/2)/(-1/12)*(-12)
(-28)/(-6+4)+(-1)
2/(-2)+0/7-(-8)*(-2)
(1/4-5/6+1/3+2/3)/1/2
18-6/(-3)*(-2)
(5+3/8*8/30/(-2)-3
(-84)/2*(-3)/(-6)
1/2*(-4/15)/2/3
(-6-24.3)-(-12+9.1)+(0-2.1);
[|-98|+76+(-87)]-23[56+(-75)-(7)]-(8+4+3)
-(-89)+|-87|-23+[-75-(7)+76]-(10+39-24)
|-9.8|+(-4.6)-[8.7-(-1.3)]+(-5.4)-(-0.2)
[-(-84)+46]-|-9.1|+(+1.9)
[-(-90)+(-34)]-(+43)+(-57)+10
5+21+8/2-6-59
68/21-8-11-8+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12



[2/3-4-1/4+(-0.4)]/1/3+2
[|-98|+76+(-87)]-23[56+(-75)-(7)]-(8+4+3)
-(-89)+|-87|-23+[-75-(7)+76]-(10+39-24)
|-9.8|+(-4.6)-[8.7-(-1.3)]+(-5.4)-(-0.2)
[-(-84)+46]-|-9.1|+(+1.9)
[-(-90)+(-34)]-(+43)+(-57)+10
5+21+8/2-6-59
68/21-8-11-8+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4+(-0.4)]/1/3+2
22+(-4)+(-2)+4-3
-2+8-8-1/2+8/1/8
(2/3+1/2)/(-1/12)+(-12)
2/(-2)+0/7-(-8)-(-2)
(1/4-5/6+1/3+2/3)/1/2
18-6/(-3)+(-2)
(5+3/8-8/30/(-2)-3
(-84)/2+(-3)/(-6)
1/2-(-4/15)/2/3
\uff08-5\uff09-\uff08+3\uff09+\uff08-9\uff09-\uff08-7\uff09
\uff08-5\uff09+\uff08+8\uff09-\uff08+2\uff09-\uff08-3\uff09
5-\uff08-3 \uff09-\uff08+7\uff09-2
\uff08-21\uff09+\uff08+16\uff09-\uff08-13\uff09-\uff08+7\uff09+\uff08-6\uff09
2 -\uff08- \uff09+\uff08-0.5\uff09+(+2)-(+ )-2
(-7)-(+5)+(+3)-(-9)
-(+2 )-(-1 )-(+3 )
-14 5 (-3)=-12
-12 (-7) (-5) (-6)
23.33-(+76.76)
(-6-24.3)-(-12+9.1)+(0-2.1)
6+(7-8)
(-78)+25+26+27
(-3)+(-2)+(-1)
39+28+26-125
[2/3-4-1/4+(-0.4)]+1/3+2
22+(-4)+(-2)+4-3
(-2)+7-(-16)-(-3)
(-5)-(+3)+(-9)-(-7)
(-1/4)+(-5/6)-(-1/3)+2/3-1/6
2/3+(-1/2)-(-1/3)+1/4
(-5)+(-8)-(-2)-3
(-21)+(+16)-(-13)-(+7)+(-6)
(-2/3)+(-1/3)+3/4+(-1/4)
(-0.73)+(-0.62)-(+0.75)
(-19)+(-11)-(-33)+27
(-6.4)+(-3.6)-(-12.5)+4.5
(-81)+(-19)-27+33
(-3.2)-(-6.2)+(-5.1)+(-4.9)
(-6.9)+(-3.1)+(+2.7)+(-2.1)
39+[-23]+0+[-16]=

[-18]+29+[-52]+60=

[-3]+[-2]+[-1]+0+1+2=

[-301]+125+301+[-75]=

[-1]+[-1/2]+3/4+[-1/4]=

[-7/2]+5/6+[-0.5]+4/5+19/6=

[-26.54]+[-6.14]+18.54+6.14=

1.125+[-17/5]+[-1/8]+[-0.6]=

[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)
5+21*8/2-6-59
68/21-8-11*8+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4*(-0.4)]/1/3+2
22+(-4)+(-2)+4*3
-2*8-8*1/2+8/1/8
(2/3+1/2)/(-1/12)*(-12)
(-28)/(-6+4)+(-1)
2/(-2)+0/7-(-8)*(-2)
(1/4-5/6+1/3+2/3)/1/2
18-6/(-3)*(-2)
(5+3/8*8/30/(-2)-3
(-84)/2*(-3)/(-6)
1/2*(-4/15)/2/3

-3x+2y-5x-7y

1\uff0e\u8ba1\u7b97\u9898
\uff081\uff093\uff0e28-4\uff0e76+1 - \uff1b

\uff082\uff092\uff0e75-2 -3 +1 \uff1b

\uff083\uff0942\u00f7\uff08-1 \uff09-1 \u00f7\uff08-0.125\uff09;

\uff084\uff09(-48) \u00f782-(-25) \u00f7(-6)2;

\uff085\uff09- +( )\u00d7(-2.4).

2.\u8ba1\u7b97\u9898\uff1a\uff0810\u2032\u00d75=50\u2032\uff09
\uff082\uff09-14-\uff082-0.5\uff09\u00d7 \u00d7[( )2-( )3];
\uff083\uff09-1 \u00d7[1-3\u00d7(- )2]-( )2\u00d7(-2)3\u00f7(- )3
\uff084\uff09(0.12+0.32) \u00f7 [-22+(-3)2-3 \u00d7 ];
5+21*8/2-6-59

\u8ba1\u7b97\uff1b\uff08x²\uff0dx\uff09\uff0b\uff08x²\uff0d2x\uff0d1\uff09

去括号
复习
1.如果括号外是正因数 。
2.如果括号外是负因数 。
例题
例一：化简下列各式
（1）8a+2b+(5a-b) (2)(5a-3b)-3(a2-2b)

合作探究
1.+（a+b）+(+a-b) 2.-(-a+b)-(a-b)

例二：先化简后求值
3(2x2y-3xy2)-(xy2-3x2y) 其中 x=12 ,y=-1

例三：已知a是最小的正整数，b是绝对值最小的负整数，∣c∣=18 ，且
abc＞0，求代数式5abc-｛2a2-[3xy2-(4ab2-a2b)]｝的值

例四：当x=-2，y=23 时，求kx-2(x-13 y2)+( -32 x+13 y2)的值，一名同学在做题时，错x=-2把看成x=2，但结果也正确，且计算过程无误，求k的值。

练习尝试
《A》大家一起做
一：合并同类项
1. x2y-a+2xy2-5x2y-4a+3xy2 2.-7x2+(6x2-5xy)-2(3y2+xy-x2)

3.-(x2y+3xy-4)+3(x2y-xy+2) 4.- 14 (2k3+4k2-28)+ 12 (k3-2k2+4k)

《B》尝试一下吧！
先化简后求值
1.2(-x2+3x3)-(2x3-2x2)+8 其中x=1;

2.3x3-3(13 x2-2x+1)+4 其中x=-2;

《C》能力提高
1. 有这样一道题“当a=0.5.b=-0.28时，求多项式7a3-6a3b+3a2b+3a3+6a3b-3a2b-10a3+3的值”，有一位同学指出，题中给出的条件是多余的，他的说法有道理吗？

2. 已知A=x2+xy+y2,B=-3xy-x2
计算 (1)B-A (2)2A-3B

3.若 12 xny2与 13 x3yb是同类项，则(ab2008-ab)-(ab2008+ab)的值是多少？

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