4/5 + 3/5 × 1/2
= 4/5 + 3/10
= 8/10 + 3/10
= 11/10
-3/4 × (1/5 - 3/10)
= -3/4 × (2/10 - 3/10)
= -3/4 × (-1/10)
= 3/40
2/3 - 1/5 ÷ 5/8
= 2/3 - 1/5 × 8/5
= 2/3 - 8/25
= 50/75 - 24/75
= 26/75
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4/5 + 3/5 × 1/2
= 4/5 + 3/10
= 8/10 + 3/10
= 11/10
-3/4 × (1/5 - 3/10)
= -3/4 × (2/10 - 3/10)
= -3/4 × (-1/10)
= 3/40
2/3 - 1/5 ÷ 5/8
= 2/3 - 1/5 × 8/5
= 2/3 - 8/25
= 50/75 - 24/75
= 26/75