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| (1)99×85+85 =(99+1)×85 =100×85 =8500; (2)563+88+437+12 =(563+437)+(88+12) =1000+100 =1100; (3)36×19-9×36 =36×(19-9) =36×10 =360; (4)55×101 =55×100+55×1 =5500+55 =5555; (5)5583-(32+583) =5583-583-32 =5000-32 =4968; (6)[294-(36+28)]-45 =[294-64]-45 =230-45 =185; (7)5600÷25÷4 =5600÷(25×4) =5600÷100 =56; (8)250÷8×4 =250×4÷8 =1000÷8 =125. |
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