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870x31十13的简便运算

3lx870十13x310=310(87 + 13)=310x100=31000

31*870+13*310=31*870+13*31*10=31*870+31*130=31*(870+130)=31*1000=31000 很高兴为你解答,祝你学习进步!有不明白的可以追问!如果您认可我的回答.请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

31*870+13*310=310*87+13*310=310*(87+13)=310*100=31000.望采纳

=31*870+13*31*10 =31*870+130*31 =31*(870+130) =31*1000 =31000

31*870+13*310=31*(87+13)=31*100=3100

13*870+13*130简便计算=13x(870+130)=13x1000=13000

31*870+13*310=31*870+130*31=31*(870+130)=31*1000=31000 祝你学业进步,望采纳~~

31x870+13x310=31x870+130x31=31x(870+130)=31x1000=31000

31*870+13*310 =(31+13)*(870+310) =44*1180 =(50-6)*1180 =(50*1180)-(6*1180) =59000-7080 =51920

692-[(430+870)÷13]=692-(1300÷13)=692-100=592

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