(2又1/3-3又1/2+1又1/45)÷(-1又2/3)

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(2又1/3-3又1/2+1又1/45)÷(-1又2/3)
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(2又1/3-3又1/2+1又1/45)÷(-1又2/3)
(2又1/3-3又1/2+1又1/45)÷(-1又2/3)

(2又1/3-3又1/2+1又1/45)÷(-1又2/3)
(2又1/3-3又1/2+1又1/45)÷(-1又2/3)
= ( 2+ 1/3 - 3 - 1/2 + 1 + 1/45 ) x (-3/ 5)
= [ 2- 3 + 1 + ( 15+1)/45 -1/2 ] x (-3/ 5)
=( 32 - 45 ) /90 x (-3/ 5)
= 13 / 90 x 3/5
= 450 分之 39
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