Răspuns:
Explicație pas cu pas:
a)
(11/16 + 7/96 - 3/40) : 21/240
16 = 2^4
96 = 2^5*3
40 = 2^3*5
cmmmc = 2^5*3*5 = 480
(330/480 + 35/480 - 36/480) : 21/240 = 329/480 * 240/21 = 47/6
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b)
(4/800 + 22/800 - 7/800) : 11/1600 * 121/400 = 19/800*1600/11*121/400
= 19*11/200 = 209/200
