Toán Lớp 6: Tính bằng cách thuận tiện :
D = 47 . ( 23 + 50 ) – 23 . ( 47 + 50 )
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Toán Lớp 6: Tính bằng cách thuận tiện :
D = 47 . ( 23 + 50 ) – 23 . ( 47 + 50 )
Comments ( 2 )
D = 47 . (23 + 50) -23 . (47 + 50)
D = 47 . 23 + 47 . 50 – 23 . 47 + 23 . 50
D = (47 . 23 – 23 .47) + (47 . 50 – 23 . 50)
D = 0 + [50 . (47 – 23)]
D = 0 + (50 . 24)
D = 0 + 1200
D = 1200
Vậy D = 1200
Giải đáp:
D = 47 . ( 23 + 50 ) – 23 . ( 47 + 50 )
D = 47.23 + 47.50 – 23.47 – 23.50
D = (47.23 – 23.47) + (47.50 – 23.50)
D = 0 + 50.(47 – 23)
D = 0 + 50.24
D = 1200
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