56乘139减5乘39怎么简便运算?
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56×139-5×39
=56×100+56×39-5×39
=39×(56-5)+5600
=39×51+5600
=39×50+39+5600
=1950+5600+39
=7589
=56×100+56×39-5×39
=39×(56-5)+5600
=39×51+5600
=39×50+39+5600
=1950+5600+39
=7589
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展开全部
56×139-5×39
=56×(100+39)-5×39
=56×100+56×39-5×39
=5600+39×(56-5)
=5600+39×51
=5600+1989
=7589
=56×(100+39)-5×39
=56×100+56×39-5×39
=5600+39×(56-5)
=5600+39×51
=5600+1989
=7589
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