解
⒈ 3xy-5xy=-2xy
⒉ 3x²-x²=2x²
⒊ 4a+3b-2a+4a
=(4a-2a)+(3b+4b)
=2a+7b
⒋0.2a+1.5b+a-b
=(0.2a+a)+(1.5b-b)
=1.2a+0.5b
⒌8a+2b+﹙5a-b﹚
=(8a+5a)+(2b-b)
=13a+b
⒍﹙5a-3b﹚-3﹙a-2b﹚——这里是平方,你会不会写错了
=(5a-3a)+(6b-3b)
=2a+3b嗯,写错了呵呵,谢谢·3⒊ 4a+3b-2a+4a——是4a吗?=(4a-2a+4a)+3b=6a+3b⒍﹙5a-3b﹚-3﹙a²-2b﹚⒍﹙5a-3b﹚-3﹙a²-2b﹚第六题是这个吗(5a-3b)-3(a²-2b)=5a-3b-3a²+6b=5a-3a²+3b
合并同类项 ⒈ 3xy-5xy ⒉ 3x²-x² ⒊ 4a+3b-2a+4a ⒋0.2a+1.5b+a-b ⒌8a+2b+﹙5a-b﹚
合并同类项 ⒈ 3xy-5xy ⒉ 3x²-x² ⒊ 4a+3b-2a+4a ⒋0.2a+1.5b+a-b ⒌8a+2b+﹙5a-b﹚
⒍﹙5a-3b﹚-3﹙a²-2b﹚
⒍﹙5a-3b﹚-3﹙a²-2b﹚
数学人气:419 ℃时间:2019-09-22 08:56:11
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