13246 / x = 1352
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2002 x 8648 + 2002 x 1352 + (1352-352)
=2002 x (8648+1352) + 1000
= 2002 x 10000 +1000
=20020000+1000
=20021000
Nha bạn
2002 x 8648 + 2003 x 1352 - 352
= 2002 x 8648 + ( 2002 + 1 ) x 1352 - 352
= 2002 x 8648 + 2002 x 1352 + 1352 - 352
= 2002 x ( 8648 + 1352 ) + 1000
= 2002 x 10000 + 1000
= 20020000 + 1000
= 20021000
![](https://rs.olm.vn/images/avt/0.png?1311)
3: Đặt x+3=a
Ta có: (x+3)(x+4)(x+5)=x
⇔a(a+1)(a+2)=a-3
⇔\(a^3+3a^2+2a-a+3=0\)
\(\Leftrightarrow a^3+3a^2+a+3=0\)
\(\Leftrightarrow a^2\left(a+3\right)+\left(a+3\right)=0\)
\(\Leftrightarrow\left(a+3\right)\left(a^2+1\right)=0\)(1)
Ta có: \(a^2\ge0\forall a\)
\(\Rightarrow a^2+1\ge1>0\forall a\)(2)
Từ (1) và (2) suy ra a+3=0
hay \(x+6=0\)
⇔x=-6
Vậy: x=-6
![](https://rs.olm.vn/images/avt/0.png?1311)
a) $420-(71+420)$
$=420-71-420$
$=-71$
b) $(35-120)+(120+410-35)$
$=35-120+120+410-35$
$=(35-35)+(-120+120)+410$
$=410$
c) $(320-15+49)-(85-51)$
$=320-15+49-85+51$
$=320+(-15-85)+(49+51)$
$=320+(-100)+100$
$=320$
d) $-(312+59)-(41+400+88)$
$=-312-59-41-400-88$
$=(-312-88)+(-59-41)-400$
$=-400+(-100)-400$
$=-500-400$
$=-900$
e) $(430-731)-(-731+430-56)$
$=430-731+731-430+56$
$=(430-430)+(-731+731)+56$
$=56$
f) $(1352-47)-(53-1000+1352)$
$=1352-47-53+1000-1352$
$=(1352-1352)+(-47-53)+1000$
$=(-100)+1000$
$=1000-100$
$=900$
h) $(-42)-(370+58)-(120-370)$
$=-42-370-58-120+370$
$=(-42-58)+(-370+370)-120$
$=-100-120$
$=-220$
$Toru$