Toán Lớp 6: tính nhẩm: 21x49=21x(.....-1)=21x....-21x1=.....-21=.....

21 . 49 = 21 . (50 - 1) = 21 . 50 - 21 . 1 = 1050 - 21 = 1029

21xx49=21xx(50-1)=21xx50-21xx1=1029

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Toán Lớp 6: tính nhẩm: 21×49=21x(-.-1)=21x–21×1=-.-21=-.

Home/ Toán Lớp 6: tính nhẩm: 21×49=21x(-.-1)=21x–21×1=-.-21=-.