简便计算:56×25×40 23×65+65×77 25×(40+4) 125×13×8 43×101 423+386+77+114.
(1)56×25×40,
=56×(25×40),
=56×1000,
=56000;
(2)23×65+65×77,
=(23+77)×65,
=100×65,
=6500;
(3)25×(40+4),
=25×40+4×25,
=1000+100,
=1100;
(4)125×13×8,
=125×8×13,
=1000×13,
=13000;
(5)43×101,
=43×(100+1),
=4300+43,
=4343;
(6)423+386+77+114,
=(423+77)+(386+114),
=500+500,
=1000.
=56×(25×40),
=56×1000,
=56000;
(2)23×65+65×77,
=(23+77)×65,
=100×65,
=6500;
(3)25×(40+4),
=25×40+4×25,
=1000+100,
=1100;
(4)125×13×8,
=125×8×13,
=1000×13,
=13000;
(5)43×101,
=43×(100+1),
=4300+43,
=4343;
(6)423+386+77+114,
=(423+77)+(386+114),
=500+500,
=1000.
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