$a.2,57×12−2,57:0,5$
$=2,57×12−2,57×2$
$=2,57×(12−2)$
$=2,57×10$
$=25,7$
$b.2,8×92+5,6:0,25$
$=2,8×92+5,6×4$
$=2,8×92+2,8×2×4$
$=2,8×(92+2×4)$
$=2,8×100$
$=280$
#Lazy warriors
@Xin ctrlhn ạ
Đáp án + giải thích :
a, 2,57 × 12 - 2,57 : 0,5
= 2,57 × 12 - 2,57 × 2
= (12-2) × 2,57
= 25,7
b, 2,8 × 92 + 5,6 : 0,25
= 2,8 × 92 + ( 2,8 × 2 ) × 4
= 2,8 × (4×2+92)
= 280
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