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420—246—54怎么简便计算

420÷35 =420÷7÷5 =60÷5 =12

=420×(101-1) =420×100 =42000

1368-680+420,先把680+420=1100,然后用1368-1100=268. 1368-680+420=268

420÷28 =420÷7÷4 =60÷4 =15

1、 原式 =420÷(7×4) =420÷28 =(420÷14)÷(28÷14) =30÷2 =15 2、 原式 =(46+55-1)×35 =100×35 =3500 ~一刻永远523为你解答,祝你学习进步~~~ 希望可以及时“选为满意答案”,你的采纳是我前进的动力~~~

简便计算 690×58+420×69 =690×(58+42) =690×100 =69000

[315-(420-42×7)]÷63 =[315-42*(10-7)]/63 =[315-42*3]/63 =5-2 =3

解: 12x(420+180/5) =12x(420+36) =12x456 =(10+2)x456 =4560+912 =5472

900-420÷60 =900-(420÷60) =900-7 =893

420×36+42×640 =42*10*(36+64) =42000

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