a) 27 . 75 + 25 . 27 - 150
b) 142 – [50 – (23 . 10 – 23 . 5)]
c) 375 : {32 – [ 4 + (5 . 32– 42)]} – 14
d) {210 : [16 + 3.(6 + 3 . 22)]} – 3
e) 500 – {5[409 – (23 . 3 – 21)2] – 1 724}
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