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bài làm
a) 2,5:x+1,5:x=100
2,5+1,5:x=100
4 :x=100
x=100:4
x=25
vậy x=25
b) \(\frac{5}{6}-x=\frac{5}{12}+\frac{1}{3}\)
\(\frac{5}{6}-x=\frac{5}{12}+\frac{4}{12}\)
\(\frac{5}{6}-x=\frac{9}{12}\)
\(x=\frac{5}{6}-\frac{9}{12}\)
\(x=\frac{10}{12}-\frac{9}{12}\)
\(x=\frac{1}{12}\)
vậy \(x=\frac{1}{12}\)
chúc bạn học tốt
2,5 : x + 1,5 : x = 100
\(\frac{2,5}{x}+\frac{1,5}{x}=100\)
\(\frac{2,5+1,5}{x}=100\)
\(\frac{4}{x}=100\)
x = 4 : 100 = 0,04
Giải:
a) \(BCNN\left(10;12\right)\)
\(10=2.5\)
\(12=2^2.3\)
\(\Rightarrow BCNN\left(10;12\right)=2^2.3.5=60\)
b) \(BCNN\left(24;10\right)\)
\(24=2^3.3\)
\(10=2.5\)
\(\Rightarrow BCNN\left(24;10\right)=2^3.3.5=120\)
c) \(BCNN\left(33;44;55\right)\)
\(33=3.11\)
\(44=2^2.11\)
\(55=5.11\)
\(\Rightarrow BCNN\left(33;44;55\right)=2^2.3.5.11=660\)
d) \(BCNN\left(4;14;26\right)\)
\(4=2^2\)
\(14=2.7\)
\(26=2.13\)
\(\Rightarrow BCNN\left(4;14;26\right)=2^2.7.13=364\)
e) \(BCNN\left(8;18;30\right)\)
\(8=2^3\)
\(18=2.3^2\)
\(30=2.3.5\)
\(\Rightarrow BCNN\left(8;18;30\right)=2^3.3^2.5=360\)
g) \(BCNN\left(6;8;10\right)\)
\(6=2.3\)
\(8=2^3\)
\(10=2.5\)
\(\Rightarrow BCNN\left(6;8;10\right)=2^3.3.5=120\)
a,= 2016-2017-2016+35+2017
=(2016-2016)+(2017-2017)+35
=0+0+35
=35
b,=1234-345+29-1234-135+59
=(1234-1234)-(345-135)+(29+59)
=0-210+88
=-122
c,=407+238-407-138+32
=(407-407)+(238-138)+32
=0+100+32
=132
.................................
mik chỉ hỏi thui mà, mik có bắt bạn giúp âu
B2"
`a)3/4+1/2-1/4`
`=3/4-1/4+1/2`
`=1/2+1/2=1`
`b)(-2)/3*5/7+(-2)/3*2/7+5/3`
`=(-2)/3*(5/7+2/7)+5/3`
`=-2/3+5/3=1`
`c)(-5)/9+5/9:(1 2/3-2 1/6)`
`=(-5)/9+5/9:(5/3-13/6)`
`=(-5)/9+5/9:(-3)/6`
`=(-5)/9+5/9*(-2)`
`=5/9*(-1-2)`
`=5/9*(-3)=-5/3`
b3:
`a)x*3/6=2/3`
`=>x*1/2=2/3`
`=>x=4/3`
`b)x/150=5/6*(-7)/25`
`=>x/150=(-7)/(6*5)=-7/30`
`=>x/150=(-35)/150`
`=>x=-35`
`c)1/2x+3/5x=3`
`=>11/10x=3`
`=>x=3*10/11=30/11`