Toán Lớp 5: tính nhanh phân số :
J 2019 + 2018 x 2057/ 2019 x 2057 – 38
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Toán Lớp 5: tính nhanh phân số :
J 2019 + 2018 x 2057/ 2019 x 2057 – 38
Comments ( 2 )
=(2019+(2019-1)×2057)/(2019×2057-38)
=(2019+2019×2057-2057×1)/(2019×2057-38)
=(2019×2057-38)/(2019×2057-38)
=1