苏教版数学四年级上册数学书答案第71页练一练答案

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练一练

1.

240÷6-2×17                    51-36÷3+25

=40-34                          =51-12+25

=6                                 =64

2.

原式=440-40×8               原式=110-100+25

 =120                                =35

练一练

苏教版数学四年级上册数学书答案第71页练一练答案

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