Đáp án+Giải thích các bước giải:
$(17x – 25): 8 + 65 = 9^2$
$(17x – 25): 8 +65 =81$
$(17x – 25): 8=81-65$
$(17x – 25): 8=16$
$17x – 25=16. 8$
$17x – 25=128$
$17x=128+25$
$17x=153$
$x=153:17$
$x=9$
$g) 5.(12 – x ) – 20 = 30 $
$ 5.(12 – x )=30+20$
$ 5.(12 – x )=50$
$12-x=50:5$
$12-x=10$
$x=12-10$
$x=2$
$h) (50 – 6x).18 = 23.32.5 $
$(50 – 6x).18 = 3680$
$50-6x=3680:18$
$50-6x=\dfrac{1840}{9}$
$6x=50-\dfrac{1840}{9}$
$6x=-\dfrac{1390}{9}$
$x=-\dfrac{1390}{9}:6$
$x=-\dfrac{695}{27}$