Tính:
a) 62 : 4 . 3 + 2 . 52;
b) 2(5 . 42 – 18).
Ta có:
a) 62 : 4 . 3 + 2 . 52 = 36 : 4 . 3 + 2 . 25
= 9 . 3 + 2 . 25
= 27 + 50
= 77
b) 2(5 . 42 – 18) = 2 ( 5 . 16 – 18 )
= 2 ( 80 – 18 )
= 2 . 62
= 124
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