Thirteen by two fifths by one thirteenth by five seventeen It's necessary to make the calculation simple and urgent!

Thirteen by two fifths by one thirteenth by five seventeen It's necessary to make the calculation simple and urgent!


13×2/5×1/13×5/17
=(13×1/13)×(2/5×5/17)
=1×2/17
=2/17



X + three quarters x = 0.5 x - one eighth = three quarters X - two fifths x = nine tenths
X + 3 / 4 x = 0.5 x - 1 / 8 x = 3 / 4 x - 2 / 5 x = very fast! These mathematical equations can't be solved


X = two out of seven, seven out of eight, three out of two,



-0.125÷8/9=___ ,___ (- two and two fifths) = three and three fourths