a, (-12)-(13-x)=-15-(-17) b, x-43=(35-x)-48 c, -(x-6+85)=(x+51)-54 d, 305-x+14=48+(x-23) e, -(35-x)-(37-x)=33-x 07/07/2021 Bởi Maya a, (-12)-(13-x)=-15-(-17) b, x-43=(35-x)-48 c, -(x-6+85)=(x+51)-54 d, 305-x+14=48+(x-23) e, -(35-x)-(37-x)=33-x
Bạn tham khảo: a, $(-12)-(13-x)=-15-(-17)$ $⇔ -12 -13 +x = -15 + 17$$⇔ x = -15 + 17 + 12 + 13$$⇔ x = 27$ b,$ x-43=(35-x)-48$ $⇔ x – 43 = 35 – x – 48$$⇔ x + x = 35 – 48 + 43$$⇔ 2x = 30$$⇔ x = 15$ c, $-(x-6+85)=(x+51)-54$ ⇔ $-x + 6 – 85 = x + 51 – 54$⇔ $-x – x = 51 – 54 – 6 + 85 $⇔ $-2x = 76$⇔ $x = -38$ d,$ 305-x+14=48+(x-23)$ $⇔ 305 – x + 14 = 48 + x – 23$$⇔ -x – x = 48 – 23 – 305 – 14$$⇔ -2x = -294$$⇔ x = 147$ e, $-(35-x)-(37-x)=33-x$$⇔ -35 + x – 37 + x = 33 – x$$⇔ x + x + x = 33 + 35 + 37$$$⇔ 3x = 105$$⇔ x = 35$ Bình luận
Đáp án:
Giải thích các bước giải:
a) -12-13+x=15+7
-25+x=22
x=22+25
x=47
Bạn tham khảo:
a, $(-12)-(13-x)=-15-(-17)$
$⇔ -12 -13 +x = -15 + 17$
$⇔ x = -15 + 17 + 12 + 13$
$⇔ x = 27$
b,$ x-43=(35-x)-48$
$⇔ x – 43 = 35 – x – 48$
$⇔ x + x = 35 – 48 + 43$
$⇔ 2x = 30$
$⇔ x = 15$
c, $-(x-6+85)=(x+51)-54$
⇔ $-x + 6 – 85 = x + 51 – 54$
⇔ $-x – x = 51 – 54 – 6 + 85 $
⇔ $-2x = 76$
⇔ $x = -38$
d,$ 305-x+14=48+(x-23)$
$⇔ 305 – x + 14 = 48 + x – 23$
$⇔ -x – x = 48 – 23 – 305 – 14$
$⇔ -2x = -294$
$⇔ x = 147$
e, $-(35-x)-(37-x)=33-x$
$⇔ -35 + x – 37 + x = 33 – x$
$⇔ x + x + x = 33 + 35 + 37$$
$⇔ 3x = 105$
$⇔ x = 35$