x+21=56
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\(\dfrac{21}{17}\times\dfrac{13}{14}\times56\times\dfrac{3}{42}\)
\(=\dfrac{21}{17}\times\dfrac{13}{14}\times56\times\dfrac{1}{14}\)
\(=\dfrac{21\times13\times56}{17\times14\times14}\)
\(=\dfrac{3\times7\times13\times14\times2\times2}{17\times2\times7\times14}\)
\(=\dfrac{3\times13\times2}{17}\)
\(=\dfrac{78}{17}\)
#Sahara |
\(56-3\left(x-3\right)=21\)
\(\Leftrightarrow56-3x+9=21\)
\(\Leftrightarrow44=3x\)
\(\Leftrightarrow x=\frac{44}{3}\)
\(56-3.\left(x-3\right)=21\)
\(\Rightarrow\) \(3.\left(x-3\right)=35\)
\(\Rightarrow\) \(x-3=\frac{35}{3}\)
\(\Rightarrow\) \(x=\frac{44}{3}\)
a/ X : 3 = 12 642
X = 12642 x 3
X = 37 926
b/ X + 21 415 = 56 743
X = 56 743 – 21 415
X = 35 328
21 / x - 8 = 49 / 56
x - 8 = 21 : 49 / 56
x - 8 = 24
x = 24 + 8
x = 32
1/ Tìm y
a) y x 42 = 4200
y = 4200 : 42
y = 100
b) y : 42 = 200
y = 200 x 42
y = 8400
2/ Tính nhanh
a) 21 x 34 + 21 x 16
= 21 x ( 34 + 16 )
= 21 x 50
= 1050
b) 34 x 56 + 56 x 36
= 56 x ( 34 + 36 )
= 56 x 70
= 3920
312 x 113 - 156 x 21 - 105 x 56
=35256 - 3276 - 5880
=31980 - 5880
=26100
Ta có:
-15/21=x/14=35/y=z/-56 =>x/14=35/y=z/-56=-5/7
=>x=-5*14/7=-10 ; y=35/(-5/7)=-49 ; z=-56*-5/7=40
\(\frac{56}{x}=\frac{14}{21}=\frac{2}{3}\)
\(\Leftrightarrow x=\frac{56.3}{2}=84\)
\(\frac{56}{x}=\frac{14}{21}\)
\(\Leftrightarrow x=84\)
Vậy x=84
x + 21 = 56
x = 56 - 21
x = 35
x+21=56
x = 56 - 21
x = 34