简便计算:(2889+2907)/28=?39*15/39*15=?、2.45*11-1.17*22=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/27 02:46:08
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简便计算:(2889+2907)/28=?39*15/39*15=?、2.45*11-1.17*22=?
简便计算:(2889+2907)/28=?
39*15/39*15=?、2.45*11-1.17*22=?
简便计算:(2889+2907)/28=?39*15/39*15=?、2.45*11-1.17*22=?
(2800+89+2800+107)/28=100+100+196/28=200+7=207
(2889+2907)/28
=5796/28
=207
39*15/39*15=?,分母是39*15?,=1,还是39,=225,不清楚
2.45*11-1.17*22=2.45*11-1.17*2*11=(2.45-1.17*2)*11=0.11*11=1.21