b) B = (15/ 34 + 3/ 15) + (19/ 34 - 12 + 4/5)
Giải thích
b) B=1534+315+1934−12+45 = 1534+315+1934−12+45=1534+1934+315+45−12
= 3434+315+1215−12=1+1515−12=1+1−12=−10
b) B=1534+315+1934−12+45 = 1534+315+1934−12+45=1534+1934+315+45−12
= 3434+315+1215−12=1+1515−12=1+1−12=−10