嵩县实验中学2015-2016学年上学期七年级数学导学案主备人:王凯瑞审批人:七年级数学组班级_______姓名_______篇次:_______第_____组组长________初批人:(1)学习目标:会熟练进行整式的加减运算知识回顾:-3x2y-10x3+3x3+6x3y+3x2y-6x3y+。(填“有”或“无”):2a+(b-c)=____________c-2(a-b)=_____________(a-b)-(-c+d)=______________自学指导:自学课本第109-111页内容,完成下列问题:化简:n+(n+1)+(n+2)+(n+3)=_____________(法则:________)=______(法则:)整式加减运算的一般步骤:先__________,再_______________自学检测::(1)3x-(-2x)=__________(2)-2x2-3x2=__________(3)-4xy-(-2xy)=:(1)2x2y3+(-4x2y3)-(-3x2y3)(2)(3x2+x-5)-(4-x+7x2)=2x-3y+5z,B-2x+4y-6z,求A-,再求值:5(3x2y-xy2)-(xy2+3x2y),x=,y=-1达标测试::(1)-7x2+(6x2-5xy)-(3y2+xy-x2)(2)(8xy-3y2)-5xy-2(3xy-2x2)已知A=4x2-4xy+y2,B=x2+xy-5y2,求:A-3B(2)3A+B先化简,再求值:2a2-b2+(2b2-a2)-(a2+2b2),a=,b=3【能力提升】已知m2-mn=21,mn-n2=-15,求m2-2mn+n2的值.
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