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$-48\times76+48\times(-123)$
$=-48\times76+(-48)\times123$
$=-48\times(76+123)$
$=-48\times199$
$=-9552$
−48.76+48.(−123)
=−48.76+(−48).123
=−48.(76+123)
=−48.199
=−9552
Bài 1:
a) \(\dfrac{65}{91}+\dfrac{-33}{55}=\dfrac{5}{7}+\dfrac{-3}{5}=\dfrac{25}{35}+\dfrac{-21}{35}=\dfrac{4}{35}\)
b) \(\dfrac{36}{-84}+\dfrac{100}{450}=\dfrac{-3}{7}+\dfrac{2}{9}=\dfrac{-27}{63}+\dfrac{14}{63}=\dfrac{-13}{63}\)
a) \(\Rightarrow\left(n+2\right)+3⋮\left(n+2\right)\)
\(\Rightarrow\left(n+2\right)\inƯ\left(3\right)=\left\{-3;-1;1;3\right\}\)
\(\Rightarrow n\in\left\{-5;-3;-1;1\right\}\)
b) \(\Rightarrow\left(n+1\right)+6⋮\left(n+1\right)\)
\(\Rightarrow\left(n+1\right)\inƯ\left(6\right)=\left\{-6;-3;-2;-1;1;2;3;6\right\}\)
\(\Rightarrow n\in\left\{-7;-4;-3;-2;0;1;2;5\right\}\)
c) \(\Rightarrow\left(n+1\right)^2-\left(n+1\right)+13⋮\left(n+1\right)\)
\(\Rightarrow\left(n+1\right)\inƯ\left(13\right)=\left\{-13;-1;1;13\right\}\)
\(\Rightarrow n\in\left\{-14;-2;0;12\right\}\)
d) \(\Rightarrow\left(n+2\right)^2-\left(n+2\right)+7⋮\left(n+2\right)\)
\(\Rightarrow\left(n+2\right)\inƯ\left(7\right)=\left\{-7;-1;1;7\right\}\)
\(\Rightarrow n\in\left\{-9;-3;-1;5\right\}\)
ai mak chẳng bt đó lak dấu nhân bn lần sau khỏi phải gt mất công
1/ 1 + (-2) + 3 + (-4) + . . . + 19 + (-20)
=1-2+3-4+...+19-20
=(1-2)+(3-4)+...+(19-20)
=(-1)+(-1)+...+(-1)
=(-1).10
=-10
2/ 1 – 2 + 3 – 4 + . . . + 99 – 100
=(1-2)+(3-4)+...+(99-100)
=(-1)+(-1)+...+(-1)
=(-1).50
=-50
3/ 2 – 4 + 6 – 8 + . . . + 48 – 50
=(2-4)+(6-8)+...+(48-50)
=(-2)+(-2)+...+(-2)
=(-2).13
=-26
4/ – 1 + 3 – 5 + 7 - . . . . + 97 – 99
=(-1)+(3-5)+(7-9)+...+(97-99)
=(-1)+(-2)+(-2)+...+(-2)
=(-1)+(-2).45
=(-1)+(-90)
=(-91)
5/ 1 + 2 – 3 – 4 + . . . . + 97 + 98 – 99 - 100
=(1+2-3-4)+...+(97 + 98 – 99 - 100)
=(-4)+...+(-4)
=(-4).25
=-100
\(HT\)
1/ \(1+(-2)+3+(-4)+...+19+(-20)\)
\(=(-1+3+5+...+19)-(2+4+6+...+20)\)
\(=(19-1):2+1=10\)
\(=(1+19).10:2-(20+2).10:2\)
\(=100-110\)
\(=-10\)
2/ \(1 – 2 + 3 – 4 + . . . + 99 – 100\)
\(= ( 1 - 2 ) + ( 3 - 4) + .... + ( 99 - 100 )\)
\(= -1 + ( -1) + ....+ ( -1)\)
\(=(-1).50\)
\(=-50\)
3/ \( 2 – 4 + 6 – 8 + . . . + 48 – 50\)
\(= 2 +( – 4 + 6)+( – 8+10) + . . . +( -44+46)+ ( 48 – 50)\)
\(= 2+2+2+...+2+( -2) \)
\(= 2.12 +( -2 ) \)
\(=22\)
4/ \(-1+3-5+7-...+97-99\)
\(= ( -1 + 3 ) + ( -5 + 7 )+....+( -93 +95 ) + ( 97 - 99 )\)
\(= -2+( -2)+...+( -2)+2\)
\(= -2.24+2\)
\(=-46\)
5/ \( 1+2-3-4+...+97+98-99-100\)
\(= ( 1+2-3-4)+...+( 97+98-99-100)\)
\(= -4+...+( -4)\)
\(=(-4).25\)
\(=-100\)
\(^{4^8}\): \(^{8^4}\)= 16 nha bn
mik tính mt đó
cs j k mik nha
48 : 84
= 48 : 46
= 48 - 6
= 42 = 16