using appropriate properties , find the sum 2/5 + -7/9 + -11/10 +5/18
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2/5 × -3/7 — 1/14 — 3/7 × 3/5
= ( 2 × -3 ) / ( 7 × 5 )- 1/14 – ( 3 × 3 ) / 35
= -6/35 – 1/14 – 9/35
=-12 – 5 – 18 / 70
=-35/70
=-1/2
Hence, 2/5 × -3/7 — 1/14 — 3/7 × 3/5=-1/2
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