3 / 4 by 2.84 divided by 3 / 5 by (1 / 2 by 1.42) by 1 / 5 by 4

3 / 4 by 2.84 divided by 3 / 5 by (1 / 2 by 1.42) by 1 / 5 by 4
=15／4 × 2.84 × 5／18 ÷ ﹙3／2 ×1.42﹚× 9／5
=15×0.71× 5／18 × 1／﹙3×0.71﹚ × 9／5
=5／2
＝2.5

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