Toán Lớp 5: Tính nhanh:
20,21.49+37.20,21+20,21×13+20,21
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Toán Lớp 5: Tính nhanh:
20,21.49+37.20,21+20,21×13+20,21
Comments ( 2 )
20,21 . 49 + 37 . 20,21 + 20,21 . 13 + 20,21
= 20,21 . 49 + 37 . 20,21 + 20,21 . 13 + 20,21 . 1
= 20,21 . (49 + 37 + 13 + 1)
= 20,21 . 100
= 2021
20,21 xx 49 + 37 xx 20,21 + 20,21 xx 13 + 20,21
= 20,21 xx (49 + 37 + 13 + 1)
= 20,21 xx 100
= 2021