如题所述
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第1个回答 2021-04-13
31×870+13×310
=31×(87×10)+13×310
=31×10×87+13×310
=310×87+13×310
=310×(87+13)
=310×100
=31000
=31×(87×10)+13×310
=31×10×87+13×310
=310×87+13×310
=310×(87+13)
=310×100
=31000
第2个回答 2021-04-13
原式=31×870+31×130
=31×(870+130)
=31×1000
=31000本回答被网友采纳
=31×(870+130)
=31×1000
=31000本回答被网友采纳
第3个回答 2021-04-13
31x870+13x310
=31x870+13x10x31
=31x870+31x130
=31x(870+130)
=31x1000
=31000
=31x870+13x10x31
=31x870+31x130
=31x(870+130)
=31x1000
=31000
第4个回答 2021-04-13
31×870+13×310
=310×87+13×87
=310×(87+13)
=310×100
=31000
=310×87+13×87
=310×(87+13)
=310×100
=31000