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
人气:470 ℃ 时间:2020-01-25 04:20:03
解答
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...
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