Toán Lớp 5: 2/483+2/575+2/675+2/783+2/899
Tính nhanh(dấu / là phân số)
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Toán Lớp 5: 2/483+2/575+2/675+2/783+2/899
Tính nhanh(dấu / là phân số)
Comments ( 2 )
=2/21.23+2/23.25+2/25.27+2/27.29+2/29.31
=1/21-1/23+1/23-1/25+1/25-1/27+1/27-1/29+1/29-1/31
=1/21-1/31
=10/651