Đáp án:
b) $(10^{5} - 991) : x = 3²$
$(100000 - 991) : x = 9$
$99009 : x = 9$
$x = 99009 : 9$
Vậy $x = 11001$
c) (x + 2³ . 5) = 5² . 3 . 12
x + 8 . 5 = 25 . 3 . 12
x + 40 = 900
x = 900 - 40
Vậy x = 860
d)$(72 . 10³ + 18 . 10³) - (3x + 3 . 10³) = 2 . 10³$
$10³(72 + 18) - (3x + 3000) = 2 . 1000$
$1000(72 + 18) - (3x + 3000) = 2000$
$1000 . 100 - (3x + 3000) = 2000$
$100000 - 3x - 3000 = 2000$
$-3x + 97000 = 2000$
$-3x = 2000 - 97000$
$-3x = -95000$
$x = -95000 : (-3)$
$x = \dfrac{95000}{3}$
Vậy $x=\dfrac{95000}{3}$
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