Simple operation of 1 / 2 × 11 / 20 + 1 / 2 △ 20 / 49

1/2×11/20+1/2÷20/49
=1/2×11/20+1/2× 49/20
=1/2×（11/20+49/20）
=1/2× 60/20
=1/2× 3
=3/2

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