C
chaobannhe


1.Tính nhẩm X :
a)X x 1998 = 1998 x 199.8
b)71+65x4 =
[TEX]\frac{X+140}{X}+140[/TEX]
a)X x 1998 = 1998 x 199.8
b)71+65x4 =
[TEX]\frac{X+140}{X}+140[/TEX]
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