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calculati a (1,2(3)-0,5(4)+0,9)-(2×4/15-2/5)

Răspuns :

(123 - 12)/90 - (54 - 5)/90 + 9/10 - 8/15 + 2/5 =
= 111/90 - 49/90 + 9/10 - 8/15 + 2/5 =
= (111 - 49)/90 + 9/10 -8/15 + 6/15 =
= 62/90 + 9/10 - 2/15 =
= (62 + 81)/90 - 8/90 =
= (143 - 8)/90 = 135/90 = 27/18 = 3/2