250 - 120 + 790
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900 + ( 120 : 1 + 0 : 250 ) = 900 + ( 120 + 0 )
= 900 + 120
= 1020
Chúc bạn học tốt ! Mik hứa sẽ tk lại ! Thanks !
900 + ( 120 :1 + 0 : 250 )
= 900 + ( 120 + 0 )
= 900 + 120
= 1020
hok tốt
\(\dfrac{x+27}{343}+\dfrac{x+28}{342}=\dfrac{x+121}{249}+\dfrac{x+120}{250}\)
\(\Rightarrow\left(\dfrac{x+27}{343}+1\right)+\left(\dfrac{x+28}{342}+1\right)=\left(\dfrac{x+121}{249}+1\right)+\left(\dfrac{x+120}{250}+1\right)\)
\(\Rightarrow\dfrac{x+370}{343}+\dfrac{x+370}{342}-\dfrac{x+370}{249}-\dfrac{x+370}{250}=0\)
\(\Rightarrow\left(x+370\right)\left(\dfrac{1}{343}+\dfrac{1}{342}-\dfrac{1}{249}-\dfrac{1}{250}\right)=0\)
Mà \(\dfrac{1}{343}+\dfrac{1}{342}-\dfrac{1}{249}-\dfrac{1}{250}\ne0\)
\(\Rightarrow x+370=0\Rightarrow x=-370\)
Vậy x = -370
\(a,BC\left(2,5,15\right)=B\left(30\right)=\left\{0;30;60;90;120;...\right\}\\ \Rightarrow x\in\left\{0;30;60;90\right\}\\ b,BC\left(8,15,40\right)=B\left(120\right)=\left\{0;240;360;480;...\right\}\\ \Rightarrow x=360\)
\(10-\left[120:3-2\left(132-117\right):2\right]\)
\(=10-\left[120:3-2.15:2\right]\)
\(=10-\left[40-30:2\right]\)
\(=10-\left[40-15\right]\)
\(=10-25\)
\(=-15\)
\(163-136:\left\{150:3-320:\left[250-\left(120+15.6\right)\right]\right\}\)
\(163-126:\left\{150:3-320:\left[250-\left(120+90\right)\right]\right\}\)
\(163-126:\left\{150:3-320:\left[250-210\right]\right\}\)
\(163-126:\left\{150:3-320:40\right\}\)
\(163-126:\left\{50-8\right\}\)
\(163-126:42\)
\(163-3\)
\(160\)
hok tốt
920 bạn nhé
chúc bạn học giỏi
250 - 120 + 790
= 130 + 790
= 920