The simple calculation is 5.7 × 1 + 2.5 △ 47.23 + 14.75-6.87 + 2.77-8

=5.7+14.75+2.77-8-6.87+2.5/47.23
=5.7+2.77+14.75-14.87+0.05
=5.7+2.65+0.05
=8.4

[8 / 15 - (4 / 5-3 / 10)] × 15 / 14 step by step

[8 / 15 - (4 / 5-3 / 10)] × 15 / 14
=【8/15-（8/10-3/10）】*15/14
=（8/15-5/10）*15/14
=（16/30-15/30）*15/14
=1/30*15/14
=1/28

Simple calculation of 5 / 7 × [7 / 8 - (1 / 2 + 3 / 8)]

5/7×[7/8-(1/2＋3/8)]
=5/7x(7/8-3/8-1/2)
=5/7x(1/2-1/2)
=5/7x0
=0
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