(x : 8 + 13 ) . 4 = 146 + 290 : 5
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\(\frac{145,7-290:5+0,3}{x:8+13}=4\)
=> \(\frac{145,7-58+0,3}{x:8+13}=4\)
=> \(\frac{88}{x:8+13}=4\)
=> \(x:8+13=88:4\)
=> \(x:8+13=22\)
=> x : 8 = 9
=> x = 9 x 8 = 72
Vậy x = 72
= \(\frac{145,7-58+0,3}{X:8+13}=4\)
=\(\frac{87,7+0,3}{X:8+13}=4\)
= \(\frac{90}{X:8+13}=4\)
X : 8 + 13 = 90 : 4
X : 8 + 13 = 22,5
X : 8 = 22,5 - 13
X : 8 = 9,5
X = 9,5 x 8
X = 76
\(\frac{145,7-290\div5+0,3}{x\div8+13}=4\)
\(\frac{88}{x\div8+13}=4\)
\(x\div8+13=88\div4\)
\(x\div8+13=22\)
\(x\div8=22-13\)
\(x\div8=9\)
\(x=9\times8\)
\(x=72\)
a) \(\frac{58}{19}+\frac{13}{17}+\frac{35}{43}+\frac{119}{19}+\frac{8}{43}\)
\(=\frac{13}{17}+\left(\frac{58}{19}+\frac{119}{19}\right)+\left(\frac{35}{43}+\frac{8}{43}\right)\)
\(=\frac{13}{17}+\frac{204}{19}+1\)
\(=\frac{1808}{133}\)
b) \(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+\frac{13}{4}\)
\(=\frac{-5}{7}.\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{13}{4}\)
\(=\frac{-5}{7}.1+\frac{13}{4}\)
\(=\frac{71}{28}\)
c) \(\frac{146}{13}-\left(\frac{21}{7}+\frac{68}{13}\right)\)
\(=\left(\frac{164}{13}-\frac{68}{13}\right)+3\)
\(=\frac{135}{13}\)
d) \(\frac{2}{7}.\frac{21}{4}-\frac{2}{7}.\frac{13}{4}\)
\(=\frac{2}{7}.\left(\frac{21}{4}-\frac{13}{4}\right)\)
\(=\frac{2}{7}.\frac{8}{4}\)
\(=\frac{4}{7}\)
P/s: Mk ko chắc nữa!
b: \(=\dfrac{-5}{7}\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{13}{4}=\dfrac{-5}{7}+\dfrac{13}{4}=\dfrac{-20+91}{28}=\dfrac{71}{28}\)
c: \(=\dfrac{146}{13}-3-\dfrac{68}{13}=6-3=3\)
d: \(=\dfrac{2}{7}\left(\dfrac{21}{4}-\dfrac{13}{4}\right)=\dfrac{4}{7}\)
(x : 8 + 13 ) . 4 = 146 + 290 : 5
( x : 8 + 13 ) . 4 = 146 + 58
( x : 8 + 13 ) . 4 = 204
x : 8 + 13 = 204 : 4
x : 8 + 13 = 51
x : 8 = 51 - 13
x : 8 = 38
x = 38 x 8
x = 304
(x : 8 + 13) . 4 = 146 + 290 : 5
(x : 8 + 13) . 4 = 146 + 58
(x : 8 + 13) . 4 = 204
x : 8 + 13 = 51
x : 8 = 38
x = 304