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1.
7/15:(1/2-9/10xX)-1/6=13/6
=>7/15:(1/2-9/10xX)=13/6+1/6
=>7/16:(1/2-9/10xX)=7/3
=>1/2-9/10xX=7/16:7/3
=>1/2-9/10xX=3/16
=>9/10xX=1/2-3/16
=>9/10xX=5/16
=>X=5/16:9/10
=>X=25/72
a. 64x23+37x23-23
=23x(64+37-1)
=23x100=2300
b. 33,76+19,52+6,24
=(33,76+6,24)+19,52
=40+19,52=59,52
c.38/11+(16/13+6/11)
=38/11+6/11+16/13
=44/11+16/13
=4+16/13=68/13
d. 3/4:3/5-1/5= 5/4-1/5= 21/20
câu 2: 2012:X+23=526
2012:X=503
X=2012:503=4
b.X+9,44=18,36
X= 18,36-9,44=8,92
c. X-3/4=6x1/24
X-3/4=1/4
X=1/4+2/4=1
d. X+2/3= 18:9-1
X+2/3=2-1=1
X= 1-2/3=1/3
câu 3:a) chu vi:350 m
diện tích:7500 m2
b)ko hiểu]
câu 4:tự làm mỏi tay rồi
a, x + 2/5 = 1/2
x = 1/2 + 2/5
x = 9/10 b,34/5 + x = 15/8
x = 34/5 - 15/8
x =197/40 c, x - 45/6 = 21/6 + 5/6
x - 45/6 = 26/6
x = 26/6 + 45/6
x =71/6 d,14/5 - x = 11/5 - 3/5
14/5 - x = 8/5
x = 14,5 - 8/5
x =6/5
a, x + 2/5 = 1/2
x = 1/2 + 2/5
x = 9/10
b,34/5 + x = 15/8
x = 34/5 - 15/8
x =197/40
c, x - 45/6 = 21/6 + 5/6
x - 45/6 = 26/6
x = 26/6 + 45/6
x =71/6
d,14/5 - x = 11/5 - 3/5
14/5 - x = 8/5
x = 14,5 - 8/5
x =6/5
- Làm lại.
i don't know
sorry nhìu nha
giải
\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=1\)
\(\left(x+x+x+x\right)+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)
\(4x=\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)
Đặt A = \(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\)
vậy ta có : \(4x+\frac{15}{16}=1\)
suy ra : \(4x=1-\frac{15}{16}\)
\(4x=\frac{1}{16}\)
\(x=\frac{1}{16}:4=\frac{1}{16}x\frac{1}{4}=\frac{1}{64}\)
Vậy \(x=\frac{1}{64}\)