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2×(4/5+7/10-75%)÷20
=2×(4/5+7/10-3/4)÷20
=(2×4/5+2×7/10-2×3/4)÷20
=(8/5+7/5-3/2)÷20
=(3-3/2)÷20
=3/2×1/20
=3/40
=2×(4/5+7/10-3/4)÷20
=(2×4/5+2×7/10-2×3/4)÷20
=(8/5+7/5-3/2)÷20
=(3-3/2)÷20
=3/2×1/20
=3/40
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