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Gọi m số là a,b,c => a+b=579, b+c=1245, c+a=912
a+b=579, b+c=1245 =>b+c-a-b=1245-579 => c-a=666
c+a=912, c-a=666 => c=789, a=123
b+c=1245, c=789 => b=456
\(a.\frac{4}{3}-\frac{3}{2}:X=\frac{1}{6}\)
\(\frac{3}{2}:X=\frac{4}{3}-\frac{1}{6}\)
\(\frac{3}{2}:X=\frac{8}{6}-\frac{1}{6}\)
\(\frac{3}{2}:X=\frac{7}{6}\)
\(X=\frac{3}{2}:\frac{7}{6}\)
\(X=\frac{3}{2}\times\frac{6}{7}\)
\(X=\frac{9}{7}\)
\(b.\left(X+\frac{2}{3}\right):\frac{1}{3}=\frac{41}{3}\)
\(X-\frac{2}{3}=\frac{41}{3}.\frac{1}{3}\)
\(X-\frac{2}{3}=\frac{41}{9}\)
\(X=\frac{41}{9}+\frac{2}{3}\)
\(X=\frac{41}{9}+\frac{6}{9}\)
\(X=\frac{47}{9}\)
\(\frac{1}{3}+x\times\frac{2}{7}=\frac{11}{12}\)
\(x\times\frac{2}{7}=\frac{11}{12}-\frac{1}{3}\)
\(x\times\frac{2}{7}=\frac{7}{12}\)
\(x=\frac{7}{12}:\frac{2}{7}\)
\(x=\frac{49}{24}\)
~Moon~
\(\frac{1}{3}+x.\frac{2}{7}=\frac{11}{12}\)
\(x.\frac{2}{7}=\frac{11}{12}-\frac{1}{3}\)
\(x.\frac{2}{7}=\frac{7}{12}\)
\(x=\frac{7}{12}\div\frac{2}{7}\)
\(x=\frac{49}{24}\)
a) 5 × x + 3 × x =1096
x × ( 5 + 3 ) = 1096
x × 8 = 1096
x = 1096 :8
x = 137
b) 189 : x - 37 : x=8
( 189 - 37 ) : x = 8
152 : x = 8
x = 152 : 8
x = 19
ủng hộ nha
a , 5 X x + 3 X x = x X ( 5+3 ) = x X 8 = 1096
=> x = 1096 : 8 = 137.
b , 189 : x - 37 : x = ( 189-37 ) : x = 152 : x = 8
=> x = 152 : 8 = 19.
Ta có: 272727x28 - 282828x27 = 27x10101x28 - 28x10101x27 = 0
Vậy, phép tính đã cho bằng 0
4) \(\frac{29x101-101}{2x19x101+4x101}\)
= \(\frac{\left(29-1\right)x101}{\left(38-4\right)x101}\)
=\(\frac{28}{34}=\frac{14}{17}\)
5) \(\left(\frac{2}{7}+\frac{11}{7}+\frac{1}{7}\right)-\frac{3}{8}-\frac{5}{8}+\frac{1}{3}\)
= \(\frac{14}{7}-\frac{8}{8}+\frac{1}{3}\)
= \(2-1+\frac{1}{3}=\frac{4}{3}\)
Nhớ tk cho mình nhé
1\(\frac{423133x846267+423134}{423133x846267+423134}=1\))
\(\frac{\left(423133+1\right)x846267-423133}{423133x846267+423134}\)
=\(\frac{423133x846267+846267-423133}{423133x846267+423134}\)
= \(\frac{423133x846267+423134}{423133x846267+423134}\)
= 1
Nhớ tk cho mình nhé (các câu sau làm riêng cho đỡ dài
\(\frac{2}{3}.\frac{4}{7}=\frac{8}{21}\)
\(\frac{3}{11}.2=\frac{6}{11}\)
\(4.\frac{2}{7}=\frac{8}{7}\)
\(\frac{8}{21}:\frac{2}{3}=\frac{8}{21}.\frac{3}{2}=\frac{21}{2.21}=\frac{1}{2}\)
\(\frac{3}{7}.\frac{7}{3}=\frac{21}{21}=1\)
\(\frac{3}{7}:\frac{3}{7}=\frac{3}{7}.\frac{7}{3}=\frac{21}{21}=1\)
lỡ tay bấm gửi trả lời luôn
\(\frac{2}{3}.\frac{1}{6}.\frac{9}{11}=\frac{2.9}{18.11}=\frac{2.9}{2.9.11}=\frac{1}{11}\)
\(\frac{2.3.4}{2.3.4.5}=\frac{6.4}{6.4.5}=\frac{24}{24.5}=\frac{1}{5}\)
a/ (x+1)+(x+2)+(x+3)+....+(x+50)=2275
<=> (x+x+...+x)+(1+2+3+...+50)=2275
<=> \(50x+\frac{50\left(50+1\right)}{2}=2275\)
<=> 50.x+1275=2275
<=> 50x=1000
=> x=1000:50 => x=20
b/ x04+40x=101x11
<=> 100x+4+400+x=1111
<=> 101x=707
=> x=707:101 => x=7
a, ( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 50 ) = 2275
x x 50 + ( 50 + 1 ) x ( 50 : 2 ) = 2257
x x 50 + 51 x 25 = 2257
x x 50 + 1275 = 2257
x x 50 = 2257 - 1275
x x 50 = 982
x = 982 : 50
x = 19,64