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初中一年级数学北师大版代数式求值和去括号的相应练习题
初中一年级数学北师大版代数式求值和去括号的相应练习题
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2019-05-11 10:15
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贺春林
5.4．代数式求值课堂小测一.填空.1．当a=－2时,代数式3a2－5=2．已知x＋y=5,xy=8,则xy－x－y=3．a为3的倒数,b为最小的正整数,则代数式3a2－2ab+1=4．已知：(x－1)2+|y+2|=0,则2x+3y=5．当x=时,代数式无意义.6...
2019-05-11 10:18:02
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