整十數(shù)加、減整十數(shù)清鎮(zhèn)市第一實驗小學申開平,,130里面有()個十,240里面有()個十,,36個十是(),47個十是(),3,4,60,70,,,40,30,,5,50,4,40,90,9,80,8,5040,90,4050,90,904050905040,50,80,10,70,30,40,60,10,40,46,2040,9070,6030,7010,3030,6020,10806,80507,...
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