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\(a,\dfrac{3}{4}-\dfrac{2}{7}=\dfrac{13}{28}\\ b,\dfrac{3}{8}-\dfrac{5}{16}=\dfrac{1}{16}\\ c,\dfrac{7}{5}-\dfrac{2}{3}=\dfrac{11}{15}\\ d,\dfrac{31}{36}-\dfrac{5}{6}=\dfrac{1}{36}\)
\(a,\dfrac{3}{4}-\dfrac{2}{7}=\dfrac{21}{28}-\dfrac{8}{28}=\dfrac{13}{28}\)
\(b,\dfrac{3}{8}-\dfrac{5}{16}=\dfrac{6}{16}-\dfrac{5}{16}=\dfrac{1}{16}\)
\(c,\dfrac{7}{5}-\dfrac{2}{3}=\dfrac{21}{15}-\dfrac{10}{15}=\dfrac{11}{15}\)
\(d,\dfrac{31}{36}-\dfrac{5}{6}=\dfrac{31}{36}-\dfrac{30}{36}=\dfrac{1}{36}\)
a) 32x31+69x31-31
=992+2070
=3062
b) 43x166+14x83
=7138+1162
=8300
c) 7/2-3/2:x=5/4
3/2:x=7/2-5/4
3/2:x= 9/4
x=3/2:9/4
x= 2/3
x - 4 : (6 +7 ) x 2 =31
x - 4 : (13 x 2) = 31
x - 4 : 26 = 31
x : 26= 31 x 4
x : 26 = 124
x=124 : 26
x = 4
t i c k nha
thiếu đè bạn ơi
x - 4 thiếu đây nè (6 +7 ) x 2 =31
a, không đủ thông tin
b, 12/27 - x = 2/9
x = 12/27 - 2/9
x = 12/27 - 6/27
x = 6/27
c, 4/5 * x = 9/7
x = 9/7 : 4/5
x = 9/7 * 5/4
x = 45/28
d, 31/29 : x = 9/7
x = 31/29 : 9/7
x = 31/29 * 7/9
x = 217/261
a: =735+23-135+177=600+200=800
b: =124-312+76-112+21=200-424+21=-203
c: =183+21+65-183-21=65
d: \(=-271+37-160+31-137=-500\)
e: =-3a+b-3c+b+3c+2a-2b
=-a
Vì (x+2)+(x+5)+(x+7)+(x+12)+.............+(x+81)+(x+131)=347
\(\Rightarrow\)(x+2)+(x+5)+(x+2+5)+(x+5+7)+(x+ 7+12)+(x+12+19)+(x+19+31)+(x+50+81)=347
\(\Rightarrow\)9x+2+5+7+12+19+31+50+81+131=347
\(\Rightarrow\)9x+362=347
\(\Rightarrow\)9x=347-362=-15
\(\Rightarrow\)x=15:9=\(\frac{5}{3}\)
Vậyx=\(\frac{5}{3}\)
\(2^4.5-\left[131-\left(31-4\right)^2\right]\)
<=>\(80-\left[131-729\right]\)
<=>\(80-\left(-598\right)\)
<=>\(678\)
=))))))))))))))))))))))))))))))