怎样简便就怎样计算.49×102-2×49 15.63+2.54+4.37+7.46 25×64×125 560-912÷24×12 41000÷(
怎样简便就怎样计算.49×102-2×4915.63+2.54+4.37+7.4625×64×125560-912÷24×1241000÷(41×5)1736÷28+10...
怎样简便就怎样计算.49×102-2×49 15.63+2.54+4.37+7.46 25×64×125 560-912÷24×12 41000÷(41×5) 1736÷28+1064÷28.
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(1)49×102-2×49,
=49×(102-2),
=49×100,
=4900;
(2)15.63+2.54+4.37+7.46,
=(15.63+4.37)+(2.54+7.46),
=20+10,
=30;
(3)25×64×125,
=25×4×2×8×125,
=(25×4)×(8×125)×2,
=100×1000×2,
=100000×2,
=200000;
(4)560-912÷24×12,
=560-38×12,
=560-456,
=104;
(5)41000÷(41×5),
=41000÷41÷5,
=1000÷5,
=200;
(6)1736÷28+1064÷28,
=(1736+1064)÷28,
=2800÷28,
=100.
=49×(102-2),
=49×100,
=4900;
(2)15.63+2.54+4.37+7.46,
=(15.63+4.37)+(2.54+7.46),
=20+10,
=30;
(3)25×64×125,
=25×4×2×8×125,
=(25×4)×(8×125)×2,
=100×1000×2,
=100000×2,
=200000;
(4)560-912÷24×12,
=560-38×12,
=560-456,
=104;
(5)41000÷(41×5),
=41000÷41÷5,
=1000÷5,
=200;
(6)1736÷28+1064÷28,
=(1736+1064)÷28,
=2800÷28,
=100.
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