数学初一题化简代数式
数学初一题化简代数式
x-{y+2x-3(x+y)}帮帮忙谢谢
x-{y+2x-3(x+y)}帮帮忙谢谢
数学人气:104 ℃时间:2020-04-03 02:01:27
优质解答
原式=x-〔y+2x-(3x+3y)〕=x-(y+2x-3x-3y)=x-y-2x+3x+3y=(x-2x+3x)+(-y+3y)=2x+2y 注意:去括号要从里到外,去括号时,如果括号前是正号,括号内符号不变;如果括号前是负号,则括号内的符号改变 呐个...楼上的 你小括号...
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