Toán Lớp 6: Tính hợp lí:
28.(15-37)-37.(28-15)
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Toán Lớp 6: Tính hợp lí:
28.(15-37)-37.(28-15)
Comments ( 2 )
= 28 . (-22) – 37 . 13
= (-616) – 481
= -1097