Áp dụng tính chất phân phối của phép nhân đối với phép cộng:
a)45 . 6
= ( 40 + 5 ) . 6
= 40 . 6 + 5 . 6
= 240 + 30
= 270
b)130 .12
= ( 100 + 30 ) . 12
= 100 . 12 + 30 . 12
= 1200 + 360
= 1560
c)79 . 101
= 79 . ( 100 + 1)
= 79 . 100 + 79 . 1
= 7900 + 79
= 7979
d)75 . 1002
= 75 . ( 1000 + 2 )
= 75 . 1000 + 75 . 2
= 75000 + 150
= 75150
easy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
troll
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troll
Trả lời:
a) 45 . 6 = ( 40 + 5 ) . 6 = 40 . 6 + 5 . 6 = 240 + 30 = 270
b) 130 .12 = 130 . ( 10 + 2 ) = 130 . 10 + 130 . 2 = 1300 + 260 = 1560
c) 79 . 101 = 79 . ( 100 + 1 ) = 79 . 100 + 79 . 1 = 7900 + 79 = 7979
d) 75 . 1002 = 75 . ( 1000 + 2 ) = 75 . 1000 + 75 . 2 = 75000 + 150 = 75150
