下面各题怎样简便就怎样算.45×17+55×17 25×66×4 &n...
下面各题怎样简便就怎样算.45×17+55×1725×66×4102×3588×12553.76-5.71-4.293.7+7.83+6.3....
下面各题怎样简便就怎样算.45×17+55×17 25×66×4 102×35 88×125 53.76-5.71-4.29 3.7+7.83+6.3.
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(1)45×17+55×17
=(45+55)×17
=100×17
=1700;
(2)25×66×4
=25×4×66
=100×66
=6600;
(3)102×35
=(100+2)×35
=100×35+2×35
=3500+70
=3570;
(4)88×125
=(80+8)×125
=80×125+8×125
=10000+1000
=11000;
(5)53.76-5.71-4.29
=53.76-(5.71+4.29)
=53.76-10
=43.76;
(6)3.7+7.83+6.3
=3.7+6.3+7.83
=10+7.83
=17.83.
=(45+55)×17
=100×17
=1700;
(2)25×66×4
=25×4×66
=100×66
=6600;
(3)102×35
=(100+2)×35
=100×35+2×35
=3500+70
=3570;
(4)88×125
=(80+8)×125
=80×125+8×125
=10000+1000
=11000;
(5)53.76-5.71-4.29
=53.76-(5.71+4.29)
=53.76-10
=43.76;
(6)3.7+7.83+6.3
=3.7+6.3+7.83
=10+7.83
=17.83.
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