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