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\(a,\Leftrightarrow x\left(12+7+1\right)=100\)
\(\Leftrightarrow x.20=100\)
\(\Leftrightarrow x=50\)
\(b,\Leftrightarrow x\left(4+3\right)=1071\)
\(\Leftrightarrow7x=1071\)
\(\Leftrightarrow x=153\)
\(c,\Leftrightarrow x-60720=960\times5\)
\(\Leftrightarrow x-60720=4800\)
\(\Leftrightarrow x=4800+60720\)
\(\Leftrightarrow x=65520\)
\(d,\Leftrightarrow x:4=22850-11250\)
\(\Leftrightarrow x:4=11600\)
\(\Leftrightarrow x=46400\)
\(\Leftrightarrow\dfrac{6}{16}\cdot2< x< \dfrac{20}{21}\cdot\dfrac{21}{4}=5\)
=>3/4<x<5
hay \(x\in\left\{1;2;3;4\right\}\)
a: x-4/5=3/7
=>x=3/7+4/5=43/35
b: x+3/7=4/5
=>x=4/5-3/7=13/35
c: 19/20-x=8/5-3/4
=>19/20-x=32/20-15/20=17/20
=>x=2/20=1/10
d: =>4/5*x=2/21
=>x=2/21:4/5=5/42
e: =>x:7/9=6/8
=>x=6/8*7/9=3/4*7/9=21/36=7/12
f: =>x/6=2/3-1/3=1/3
=>x=2
a: x-4/5=3/7
=>x=3/7+4/5=43/35
b: x+3/7=4/5
=>x=4/5-3/7=13/35
c: 19/20-x=8/5-3/4
=>19/20-x=32/20-15/20=17/20
=>x=2/20=1/10
d: =>4/5*x=11/21
=>x=55/84
e: =>x=6/8*7/9=42/72=7/12
f: =>x/6=2/3-1/3=1/3
=>x=2
a).(x+x+x+x+...+x)+(1+3+5+....+19)=245
=X*10+100=245
X*10=245-100
X*10=145
x=145:10
x=14,5
mk đi mk tl câu tiếp theo
a, \(x+1+x+3+.....+x+19=245\Rightarrow x+x+x+...+x+1+3+...+19=245\)
\(\Rightarrow10x+\frac{\left(19+1\right)\cdot10}{2}=245\Rightarrow10x+100=245\Rightarrow10x=145\Rightarrow x=14,5\)
b,\(x+2+x+4+...+x+20=155\Rightarrow x+x+...+x+2+4+...+20\)
\(\Rightarrow10x+\frac{\left(20+2\right)\cdot10}{2}=155\Rightarrow10x+110=155\Rightarrow10x=45\Rightarrow x=4,5\)
\(x\times2+x\times4+x\times6+...+x\times18+x\times20=440\)
\(\Rightarrow x\times\left(2+4+6+...+18+20\right)=440\)
\(\Rightarrow x\times110=440\)
\(\Rightarrow x=440\div110\)
\(\Rightarrow x=4\)
Vậy : \(x=4\)
x*2+x*4+x*6+.....+x*18+x*20=440
x*(2+4+6+...+18+20)=440
Có
4-2=6-4=...=20-18=2
số liền trước hơn số liền sau 2 đơn vị
SSH là :(20-2):2+1=10
tổng là : (20+2)*10:2=110
thay vào ta có :
x*110=440
x=440 : 110
x=4
vậy x=4
x - 4/5 = 3/7
x = 3/7 + 4/5
x = 43/35
x + 3/7 = 4/5
x = 4/5 - 3/7
x = 13/35
19/20 - x = 8/5 - 3/4
19/20 - x = 17/20
x = 19/20 - 17/20
x = 2/20 = 1/10
4/5 x X = 6/9 - 4/7
4/5 x X = 2/21
x = 2/21 : 4/5
x =5/42
x : 7/9 = 6/8
x = 6/8 x 7/9
x = 7/12
2/3 - x/6 = 6/18
x/6 = 2/3 - 6/18
x/6 = 1/3
x/6 = 2/6
=> x =2
1. x = 43/35
2. x = 13/35
3. x = 1/10
còn lại tự tính nhá
tui bận òi
Hướng dẫn giải:
a.
17 x 543 + 83 x 543
= (17 + 83) x 543
= 100 x 543
= 54300
b.
318 x 963 + 682 x 963
= (318 + 682) x 963
= 1000 x 963
= 963000
a)17x543+83x543
=(17+83)x543
=100x543
=54300
b)318x963+682x963
=(318+682)x963
=1000x963
=963000
318-x:6=20
x:6=318-20
x:6=298
x=298*6
x=1788
318-x:6=20
x:6=318-20
x:6=298
x=298x6
x=1788