Simple calculation: 1. 5 / 7 times 14 / 25 plus 1 / 3 Simple calculation of 1.90 minus 90 times 2 / 15 17 × 2 / 9 × 51 / 2 times 2 / 9 3.42 × (19 / 14-8 / 21) simple calculation Who can write which,

1、
=90 × (2 / 1-15)
=90 × 13 / 15
=78
2、
=(2 / 17 × 51) × (2 / 9 × 2 / 9)
=2 / 3 × 4 / 81
=8 / 243
3、
=19 / 42 × 14-8 / 42 × 21
=57-16
=41

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