8100÷4÷7575×27+19×2531×870+13×3104×(25×65+25×28
8100÷4÷7575×27+19×2531×870+13×3104×(25×65+25×28)...
8100÷4÷7575×27+19×2531×870+13×3104×(25×65+25×28)
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①8100÷4÷75
=8100÷(4×75)
=8100÷300
=27
②75×27+19×25
=(25×3)×27+19×25
=25×(3×27)+19×25
=25×81+19×25
=25×(81+19)
=2500
③31×870+13×310
=31×(10×87)+13×310
=310×87+13×310
=310×(87+13)
=31000
④4×(25×65+25×28)
=4×25×65+4×25×28
=6500+2800
=9300
=8100÷(4×75)
=8100÷300
=27
②75×27+19×25
=(25×3)×27+19×25
=25×(3×27)+19×25
=25×81+19×25
=25×(81+19)
=2500
③31×870+13×310
=31×(10×87)+13×310
=310×87+13×310
=310×(87+13)
=31000
④4×(25×65+25×28)
=4×25×65+4×25×28
=6500+2800
=9300
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