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What is the reciprocal of two fifths? Five fifths or two and a half? As above
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5 / 2 = 2 and 1 / 2
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One and one third * () = two thirteenth * () = four and two fifths / () = one and one half - one half
Add bracket
One and one third * (3 / 4) = two thirteenth * (13 / 2) = four and two fifths / (22 / 5) = one and one half - one half
Explanation: the front is numerator and the back is denominator
One road needs to be built for two fifths of a kilometer, and the rest is two fifths of a kilometer more than one and a half times the one built by Israel. How many kilometers is the total length of this road?
Total length = 2 / 5 × 1.5 + 2 / 5 + 2 / 5 = 7 / 5km
Can 3 / 5 × 2 / 3 + 2 / 5 △ 1 / 2 be easily calculated
Three fifths × two thirds + two fifths △ one and one half
=3/5×2/3+2/5×2/3
=（3/5+2/5）×2/3
=2/3
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