Explanation:
#1
4 + 5×3 (= 4 + 15 = 19)
#2
25/5 + 3 (= 5 + 3 = 8)
#3
16 - 4×2 (= 16 - 8 = 8)
#4
6×2 - 1 (= 12 - 1 = 11)
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