简便计算.
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| (1)276+28+172+224 =276+224+(28+172) =500+200 =700; (2)164-83-17 =164-(83+17) =164-100 =64; (3)25×67×4 =25×4×67 =100×67 =6700; (4)87000÷8÷125 =87000÷(8×125) =87000÷1000 =87; (5)66×39+39×34 =(66+34)×39 =100×39 =3900; (6)125×56 =125×8×7 =1000×7 =7000. |
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