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a)8,3 x 6,9 + 8,3 + 2,1 x 8,3
= 8,3 x ( 6,9 + 2,1+1)
= 8,3 x 10
=83
b)
x+x\(\times\)2+x\(\times\)3=1,23
x\(\times\)(1+2+3)=1,23
x\(\times\)6=1,23
x=1.23:6
x=0,205
bài 1:
a)=8.5025
b)=123.1586022...
bài 2
a)x=5.255
b)x=394.85
c)x=14.075
d)x=617.5
\(\)Bài 1:
\(a)2,45\times\left(3,45+5,6\right)-13,67\)
\(=2,45\times9,05-13,67\)
\(=22,1725-13,67\)
\(=8,5025\)
\(b)46,75:\left(12,45-3,15\right)\times24,5\)
\(=46,75:9,3\times24,5\)
\(=\frac{935}{186}\times\frac{49}{2}\)
\(=\frac{45815}{372}\)
\(\)Bài 2:
\(a)18,355+x=23,61\)
\(x=23,61-18,355\)
\(x=5,255\)
\(b)225,35-x=169,5\)
\(x=225,35-169,5\)
\(x=55,85\)
\(c)x:2,5=5,63\)
\(x=5,63\times2,5\)
\(x=14,075\)
\(d)x:100=6,175\)
\(x=100\times6,175\)
\(x=6175\)
3/5 - 1/3 x (2,48 + 0,52) x y : 60 : 5 = 1/5
1/3 x (2,48+0,52) x y : 60 : 5 = 2/5
1/3 x 3 x y : 60 : 5 = 2/5
y: 60 : 5 =2/5
y: 60 =2/5 x 5
y : 60 =2
y = 2 x 60
y =120
Ta có: \(\dfrac{3}{5}-\dfrac{1}{3}\left(2.48+0.52\right)\cdot y:60:5=\dfrac{1}{5}\)
\(\Leftrightarrow\dfrac{3}{5}-\dfrac{1}{3}\cdot3\cdot y\cdot\dfrac{1}{60}\cdot\dfrac{1}{5}=\dfrac{1}{5}\)
\(\Leftrightarrow y\cdot\dfrac{1}{300}=\dfrac{2}{5}\)
hay y=120
= 6,94 x 1,6 + 6,94 x 5 + 6,94 x 3,4
= 6,94 x (1,6 + 3,4 + 5)
= 6,94 x 10
= 69,4
\(\left(\frac{1}{25}-\frac{1}{30}\right).150+1,03:1,03.\left(x-1\right)=3\)
\(\frac{1}{150}.150+1.\left(x-1\right)=3\)
\(1+\left(x-1\right)=3\)
\(x-1=3-1=2\)
\(x=2+1\)
\(x=3\)
Dấu "." là dấu nhân nha em.
X.8,7-2,02=264,2 x.7,9+8,3=53,598
x.8,7=264,2+2,02 x.7,9=53,598-8,3
x.8,7=266,22 x.7,9=45,298
x=266,22:8.7 x=45,2988:7,9
x=30,6 x=5,7339
149,5:(x+31,78)=2,3
x+31,78=149,5:2,3
x+31,78=65 x-7.94=12,72:10,6
x=65-31,78 x-7,94=1,2
x=33,22 x=1,2+7,94
x=9,14
a) \(3,72\left(x-1,03\right)=13,02\)
\(3,72x-3,8316=13,02\)
\(3,72x=16,85\)
\(x=4,53\)
b) \(2,45\left(x-2,48\right)=21,07\)
\(2,45x-6,076=21,07\)
\(2,45x=27,146\)
\(x=11,08\)