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The fourth grade mathematics oral calculation problem volume one
Five, with a simple method to calculate

1.74×53+47×74 2.2 169–642–358

3.948+ 106 1+52+939 4. 125×64

Six, off-type calculation

1.375+ 137÷(69+68) 2.2.5+28.6+0.73

3.5.06–(3. 14+0.4) 4.4900–20+ 15× 17

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