六年级数学题（分数四则混合运算)

（1/3+1/4)x6/7
=7/12×6/7
=1/2

1/2÷3/4+3/8
=1/2×4/3+3/8
=2/3+3/8
=(16+9)/24
=25/24

2/3x5/7+2/7÷3/2
=10/21+2/7×2/3
=10/21+4/21
=14/21
=2/3

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