下面各题怎样算简便就怎样算. 72.8÷5.6+24.9 5.8×13.7+5.8×6.3 49×101-49 2.5×32×1.
下面各题怎样算简便就怎样算.72.8÷5.6+24.95.8×13.7+5.8×6.349×101-492.5×32×1.253.9÷1.5÷232.7+0.14×50....
下面各题怎样算简便就怎样算. 72.8÷5.6+24.9 5.8×13.7+5.8×6.3 49×101-49 2.5×32×1.25 3.9÷1.5÷2 32.7+0.14×50.
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(1)72.8÷5.6+24.9,
=13+24.9,
=37.9;
(2)5.8×13.7+5.8×6.3,
=(13.7+6.3)×5.8,
=20×5.8,
=116;
(3)49×101-49,
=(101-1)×49,
=100×49,
=4900;
(4)25×32×1.25,
=(25×4)×(1.25×8),
=100×10,
=1000;
(5)3.9÷1.5÷2,
=3.9÷(1.5×2),
=3.9÷3,
=1.3;
(6)32.7+0.14×50,
=32.7+7,
=39.7.
=13+24.9,
=37.9;
(2)5.8×13.7+5.8×6.3,
=(13.7+6.3)×5.8,
=20×5.8,
=116;
(3)49×101-49,
=(101-1)×49,
=100×49,
=4900;
(4)25×32×1.25,
=(25×4)×(1.25×8),
=100×10,
=1000;
(5)3.9÷1.5÷2,
=3.9÷(1.5×2),
=3.9÷3,
=1.3;
(6)32.7+0.14×50,
=32.7+7,
=39.7.
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