(x-1/2):1/3=9và5/7-5/7
(x-1/2):1/3=9
x-1/2=9.1/3
x-1/2=3
x=3+1/2
->x=7/2
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Ôn tập chương II
Các câu hỏi tương tự
Tính
a, A=\(\left(\frac{-40}{51}.0,32.\frac{17}{20}\right).\frac{64}{75}\)
b, B=\(4\frac{5}{9}:\left(\frac{-5}{7}\right)-5\frac{4}{9}:\frac{5}{7}\)
c, C= \(1\frac{5}{7}.15+\frac{2}{9}.\left(-15\right)+105.\left(\frac{-2}{3}+\frac{4}{5}-\frac{1}{7}\right)\)
Bài 1: Tính Nhanh
a) 11frac{1}{4}-left(2frac{5}{7}+5frac{1}{4}right)
b) left(8frac{5}{11}+3frac{5}{8}right)-3frac{5}{11}
c) -frac{1}{4}.13frac{9}{11}-0,25.6frac{2}{11}
d)frac{4}{9}:left(frac{-1}{7}right)+6frac{5}{9}:left(frac{-1}{7}right)
Bài 2: Tìm X
a)X:8,25left(-2,2right)
b)-4frac{1}{5}.X2,25
c) left(frac{2X}{5}-1right):left(-5right)frac{1}{7}
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Nhanh hộ em ạ ^^
Đọc tiếp
Bài 1: Tính Nhanh
a) \(11\frac{1}{4}-\left(2\frac{5}{7}+5\frac{1}{4}\right)\)
b) \(\left(8\frac{5}{11}+3\frac{5}{8}\right)-3\frac{5}{11}\)
c) \(-\frac{1}{4}.13\frac{9}{11}-0,25.6\frac{2}{11}\)
d)\(\frac{4}{9}:\left(\frac{-1}{7}\right)+6\frac{5}{9}:\left(\frac{-1}{7}\right)\)
Bài 2: Tìm X
a)\(X:8,25=\left(-2,2\right)\)
b)\(-4\frac{1}{5}.X=2,25\)
c) \(\left(\frac{2X}{5}-1\right):\left(-5\right)=\frac{1}{7}\)
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Nhanh hộ em ạ ^^
Bài 1:Tính
1)frac{7}{5}+frac{-8}{5} ; 2)frac{-6}{5}timesfrac{15}{24} ; 3) left(frac{2}{3}+1,5right)-3,5:7frac{1}{2} ; 4)frac{5}{8}-frac{-7}{9} ; 5)frac{-7}{3}timesfrac{12}{28}.
Bài 2:Tìm x
1)x-70-45 ; 2)frac{4}{7}:xfrac{12}{28} ; 3)left(frac{2}{3}x+1,5right)-3,5:7frac{1}{2} ;
4)x-50-35 ;5)frac{4}{7}times xfrac{11}{28} ;6)left(frac{2}{3}x+2,5right):2frac{2}{6}6
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m.n có trước cho e ngày 28/4/2019 nhé :)
Đọc tiếp
Bài 1:Tính
1)\(\frac{7}{5}+\frac{-8}{5}\) ; 2)\(\frac{-6}{5}\times\frac{15}{24}\) ; 3) \(\left(\frac{2}{3}+1,5\right)-3,5:7\frac{1}{2}\) ; 4)\(\frac{5}{8}-\frac{-7}{9}\) ; 5)\(\frac{-7}{3}\times\frac{12}{28}\).
Bài 2:Tìm x
1)\(x-70=-45\) ; 2)\(\frac{4}{7}:x=\frac{12}{28}\) ; 3)\(\left(\frac{2}{3}x+1,5\right)-3,5:7\frac{1}{2}\) ;
4)x-50=-35 ;5)\(\frac{4}{7}\times x=\frac{11}{28}\) ;6)\(\left(\frac{2}{3}x+2,5\right):2\frac{2}{6}=6\)
m.n ơi!!!
giúp em vs ạ,e đag cần gấp,e sắp thi r
m.n có trước cho e ngày 28/4/2019 nhé :)
Tìm x biết :
a, \(\frac{1}{3}.x+\frac{2}{5}.\left(x-1\right)=0\)
b,\(3.\left(x-\frac{1}{2}\right)-5.\left(x+\frac{3}{5}\right)=x+\frac{1}{5}\)
\(\frac{1}{4}+\frac{1}{3}:\left(2x-1\right)=-5\)
\(3\left(x-\frac{1}{2}\right)-5\left(x+\frac{3}{5}\right)=-x+\frac{1}{5}\)
\(\left(2x-3\right)\left(6-2x\right)=0\)
bài 2:
a,6frac{4}{5}-(1frac{2}{3}+3frac{4}{5})
b,6frac{5}{7}-(1frac{3}{4}+2frac{5}{7})
c,7frac{5}{9}-(2frac{3}{4}+3frac{5}{9})
d,7frac{5}{11}-(2frac{3}{7}+3frac{5}{11})
e,frac{-3}{5}.frac{5}{7}+frac{-3}{5}.frac{15}{19}+frac{5}{7}
f,frac{1}{3}.frac{4}{5}+frac{1}{3}.frac{6}{5}-frac{4}{3}
g,frac{4}{19}.frac{-3}{7}+frac{-3}{7}.frac{15}{19}+frac{5}{7}
h,frac{5}{9}.frac{7}{13}+frac{5}{9}.frac{9}{13}-frac{5}{9}.frac{3}{13}
mn ơi,giúp mk với ạ,mk cần gấp
Đọc tiếp
bài 2:
a,\(6\frac{4}{5}\)-(\(1\frac{2}{3}\)+\(3\frac{4}{5}\))
b,\(6\frac{5}{7}\)-(\(1\frac{3}{4}\)+\(2\frac{5}{7}\))
c,\(7\frac{5}{9}\)-(\(2\frac{3}{4}\)+\(3\frac{5}{9}\))
d,\(7\frac{5}{11}\)-(\(2\frac{3}{7}\)+\(3\frac{5}{11}\))
e,\(\frac{-3}{5}\).\(\frac{5}{7}\)+\(\frac{-3}{5}\).\(\frac{15}{19}\)+\(\frac{5}{7}\)
f,\(\frac{1}{3}\).\(\frac{4}{5}\)+\(\frac{1}{3}\).\(\frac{6}{5}\)-\(\frac{4}{3}\)
g,\(\frac{4}{19}\).\(\frac{-3}{7}\)+\(\frac{-3}{7}\).\(\frac{15}{19}\)+\(\frac{5}{7}\)
h,\(\frac{5}{9}\).\(\frac{7}{13}\)+\(\frac{5}{9}\).\(\frac{9}{13}\)-\(\frac{5}{9}\).\(\frac{3}{13}\)
mn ơi,giúp mk với ạ,mk cần gấp
bài 1:
a,frac{3}{5}+frac{4}{15}
b,frac{-3}{5}+frac{5}{7}
c,frac{5}{6}:frac{-7}{12}
d,frac{-21}{24}:frac{-14}{8}
e,frac{-3}{5}.frac{5}{7}+frac{-3}{5}.frac{3}{7}+frac{-3}{5}.frac{6}{7}
f,frac{1}{3}.frac{4}{5}+frac{1}{3}.frac{6}{5}-frac{4}{3}
g,frac{4}{19}.frac{-3}{7}+frac{-3}{7}.frac{5}{19}+frac{5}{7}
h,frac{5}{9}.frac{7}{13}+frac{5}{9}.frac{9}{13}-frac{5}{9}.frac{3}{13}
mn ơi,giúp mk bài này với ạ,mk đag cần gấp
Đọc tiếp
bài 1:
a,\(\frac{3}{5}\)+\(\frac{4}{15}\)
b,\(\frac{-3}{5}\)+\(\frac{5}{7}\)
c,\(\frac{5}{6}\):\(\frac{-7}{12}\)
d,\(\frac{-21}{24}\):\(\frac{-14}{8}\)
e,\(\frac{-3}{5}\).\(\frac{5}{7}\)+\(\frac{-3}{5}\).\(\frac{3}{7}\)+\(\frac{-3}{5}\).\(\frac{6}{7}\)
f,\(\frac{1}{3}\).\(\frac{4}{5}\)+\(\frac{1}{3}\).\(\frac{6}{5}\)-\(\frac{4}{3}\)
g,\(\frac{4}{19}\).\(\frac{-3}{7}\)+\(\frac{-3}{7}\).\(\frac{5}{19}\)+\(\frac{5}{7}\)
h,\(\frac{5}{9}\).\(\frac{7}{13}\)+\(\frac{5}{9}\).\(\frac{9}{13}\)-\(\frac{5}{9}\).\(\frac{3}{13}\)
mn ơi,giúp mk bài này với ạ,mk đag cần gấp
bài 1:thực hiện phép tính
a,frac{65}{91}+frac{-33}{55} b,frac{36}{-84}+frac{100}{450} c,frac{3}{7}+frac{1}{2}-frac{-3}{70} d,frac{3}{5}+frac{-1}{25}-frac{-35}{100}
bài 2:tìm x,bt
a,x-frac{-1}{5}frac{7}{25} b,x+frac{5}{11}frac{4}{-9} c,frac{5}{9}+frac{x}{-1}frac{-1}{3} d,|x-4||frac{-6}{7}|+frac{3}{2}
bài 3:tính nhanh(hợp lí)
a,Afrac{2}{15}+frac{2}{35}+frac{2}{63}+frac{2}{99}+frac{2}{143}
b,Bfrac{1}{21}+frac{1}{77}+frac{1}{165}+frac{1}{285}
c,so...
Đọc tiếp
bài 1:thực hiện phép tính
a,\(\frac{65}{91}\)+\(\frac{-33}{55}\) b,\(\frac{36}{-84}\)+\(\frac{100}{450}\) c,\(\frac{3}{7}\)+\(\frac{1}{2}\)-\(\frac{-3}{70}\) d,\(\frac{3}{5}\)+\(\frac{-1}{25}\)-\(\frac{-35}{100}\)
bài 2:tìm x,bt
a,x-\(\frac{-1}{5}\)=\(\frac{7}{25}\) b,x+\(\frac{5}{11}\)=\(\frac{4}{-9}\) c,\(\frac{5}{9}\)+\(\frac{x}{-1}\)=\(\frac{-1}{3}\) d,|x-4|=|\(\frac{-6}{7}\)|+\(\frac{3}{2}\)
bài 3:tính nhanh(hợp lí)
a,A=\(\frac{2}{15}\)+\(\frac{2}{35}\)+\(\frac{2}{63}\)+\(\frac{2}{99}\)+\(\frac{2}{143}\)
b,B=\(\frac{1}{21}\)+\(\frac{1}{77}\)+\(\frac{1}{165}\)+\(\frac{1}{285}\)
c,so sánh C=\(\frac{1}{11}\)+\(\frac{1}{12}\)+\(\frac{2}{12}\)+.................+\(\frac{1}{20}\)với \(\frac{1}{2}\)
mn giúp mk với ạ,mk đag cần gấp lắm,phải nộp luôn ạ,lm ơn
bài 1
a,frac{x}{5}frac{2}{3}
b,frac{x}{3}-frac{1}{2}frac{1}{5}
c,frac{x}{5}+frac{1}{2}frac{6}{10}
d,frac{x+3}{15}frac{1}{3}
e,frac{x-12}{4}frac{1}{2}
h,frac{4}{5}+xfrac{2}{3}
i,frac{3}{4}-xfrac{1}{3}
k,frac{-5}{6}-xfrac{2}{3}
l,x-frac{5}{9}frac{-2}{3}
m,frac{1}{2}x+frac{1}{2}frac{5}{2}
n,frac{-2}{3}-frac{1}{3}(2x-5)frac{3}{2}
p,(3x-1)(-frac{1}{2}x+5)0
q,3frac{1}{3}+frac{5}{6}x3frac{1}{2}
s,frac{1}{2}-frac{2}{3}xfrac{7}{12}
t,frac{3}{4}x+frac{1}{5}frac{1}{6}
u,frac{3}{8}-frac{1}{...
Đọc tiếp
bài 1
a,\(\frac{x}{5}\)=\(\frac{2}{3}\)
b,\(\frac{x}{3}\)-\(\frac{1}{2}\)=\(\frac{1}{5}\)
c,\(\frac{x}{5}\)+\(\frac{1}{2}\)=\(\frac{6}{10}\)
d,\(\frac{x+3}{15}\)=\(\frac{1}{3}\)
e,\(\frac{x-12}{4}\)=\(\frac{1}{2}\)
h,\(\frac{4}{5}\)+x=\(\frac{2}{3}\)
i,\(\frac{3}{4}\)-x=\(\frac{1}{3}\)
k,\(\frac{-5}{6}\)-x=\(\frac{2}{3}\)
l,x-\(\frac{5}{9}\)=\(\frac{-2}{3}\)
m,\(\frac{1}{2}\)x+\(\frac{1}{2}\)=\(\frac{5}{2}\)
n,\(\frac{-2}{3}\)-\(\frac{1}{3}\)(2x-5)=\(\frac{3}{2}\)
p,(3x-1)(\(-\frac{1}{2}\)x+5)=0
q,\(3\frac{1}{3}\)+\(\frac{5}{6}\)x=\(3\frac{1}{2}\)
s,\(\frac{1}{2}\)-\(\frac{2}{3}\)x=\(\frac{7}{12}\)
t,\(\frac{3}{4}\)x+\(\frac{1}{5}\)=\(\frac{1}{6}\)
u,\(\frac{3}{8}\)-\(\frac{1}{6}\)x=\(\frac{1}{4}\)
mn ơi'-' xin hãy giúp mk với ạ>^<,mk cần rất gấp,mai nộp r ạ,mong mn giúp mk với ạ:(( huhuhu r mk tik cho:<<