Calculated by formula; 28.7-6.8x5 △ 34 + 12.3

Calculated by formula; 28.7-6.8x5 △ 34 + 12.3

28.7-6.8x5÷34+12.3
=28.7+12.3-6.8x5÷34
=41-34/34
=40

[4 / 7-3 / 14 * 28] / (1 / 5 * 4) take off formula calculation, and those that can be calculated simply should be calculated simply. Speed!

=(4/7-3*2)÷(4/5)
=(4/7-3*2)*5/4
=4/7*5/4-6*5/4
=5/7-15/2
=(10-105)/14
=-95/14
=-6 and 11 / 14

Out of formula calculation ① 23 / 28 + (13 / 14 + 2 / 7)
emergency

23/28+(13/14+2/7)
=23/28+13/14+2/7
=23/28+26/28+8/28
=56/28
=2
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