问题
解答题
简便计算.
|
答案
(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.