Đáp án:
a,49-(3 . 5² .170)
= 49 - (3 . 25 . 170)
= 49 - ( 3 . 4250)
= 49 - 12750
= -12701
b,147-[15-(4² . 3 - 125)]
= 147 - [15 - (16 . 3 - 125)]
= 147 - [ 15 - (48 - 125)]
= 147 - [ 15 - (-77)]
= 147 - 92
= 55
c, /-27/ + [-19 - (2³ . 3-13)]
= 27 + [-19 - (8 . 3 - 13)]
= 27 + [-19 - (24 - 13)]
= 27 + [-19 - 11]
= 27 + -30
= -3
d, 3 . (-5²) - (3² . 5 - 5² . 3)
= 3 . 25 - (9 . 5 - 25 . 3)
= 75 - ( 45 - 75)
= 75 - 45 + 75
=105
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