Toán Lớp 5: Tính tổng sau
3/4+3/4×7+3/7/10…….3/28×31+3/31×24
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Toán Lớp 5: Tính tổng sau
3/4+3/4×7+3/7/10…….3/28×31+3/31×24
Comments ( 2 )
=3/4+(1/4-1/7+1/7-1/10+…+1/31-1/34)
=3/4+(1/4-1/34)
=51/68+15/68
=33/34