17x47 47x19 19x36 36x34用乘法分配律计算
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17x47 47x19 19x36 36x34用乘法分配律计算
17X47
=(10+7)X47
=10X47+7X47
=470+329
=799
47x19
=47X(20-1)
=47X20-47
=940-47
=893
19X36
=(20-1)X36
=20X36-36
=720-36
=684
36X34
=(40-4)X34
=40X34-4X34
=1360-136
=1224
17X47
=(10+7)X47
=10X47+7X47
=470+329
=799
47x19
=47X(20-1)
=47X20-47
=940-47
=893
19X36
=(20-1)X36
=20X36-36
=720-36
=684
36X34
=(40-4)X34
=40X34-4X34
=1360-136
=1224
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