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43 x 166 + 14 x 83
= 43 x ( 83 x 2 ) + 14 x 83
= (43 x 2) x 83 + 14 x 83
= 86 x 83 + 14 x 83
= ( 86 + 14 ) x 83
= 100 x 83
= 8300
43 x 166 + 14 x 83
= 43 x ( 83 x 2 ) + 14 x 83
= ( 43 x 2 ) x 83 + 14 x 83
= 86 x 83 + 14 x 83
= 83 x ( 86 + 14 )
= 83 x 100
= 8300
\(\frac{7}{2}\)- \(\frac{3}{2}\): x = \(\frac{5}{4}\)
\(\frac{3}{2}\): x = \(\frac{7}{2}-\frac{5}{4}\)
\(\frac{3}{2}\): x = \(\frac{14}{4}-\frac{5}{4}\)
\(\frac{3}{2}\): x = \(\frac{9}{4}\)
x = \(\frac{3}{2}:\frac{9}{4}\)
x = \(\frac{3}{2}x\frac{9}{4}\)
x = \(\frac{27}{8}\)
\(y-\frac{5}{13}=2\)
\(y=2+\frac{5}{13}\)
\(y=\frac{31}{13}\)
Vậy ta chọn câu A
Mình làm tìm y thôi
a) \(6-\dfrac{2}{5}+\dfrac{3}{5}\) x \(3\)
\(=6-\dfrac{2}{5}+\dfrac{9}{5}\)
\(=\dfrac{30}{5}-\dfrac{2}{5}+\dfrac{9}{5}\)
\(=\dfrac{30-2+9}{5}=\dfrac{37}{5}\)
b) \(\left(\dfrac{31}{35}-\dfrac{4}{7}\right)\) x \(\dfrac{8}{7}:2\)
\(=\left(\dfrac{31}{35}-\dfrac{20}{35}\right)\) x \(\dfrac{8}{7}:2\)
\(=\dfrac{11}{35}\) x \(\dfrac{8}{7}:2\)
\(=\dfrac{11}{35}\) x \(\dfrac{8}{7}\) x \(\dfrac{1}{2}\)
\(=\dfrac{\text{11 x 8 x 1}}{\text{ 35 x 7 x 2}}=\dfrac{88}{490}=\dfrac{88}{245}\)
a) 6−25+356−25+35 x 33
=6−25+95=6−25+95
=305−25+95=305−25+95
=30−2+95=375=30−2+95=375
b) (3135−47)(3135−47) x 87:287:2
=(3135−2035)=(3135−2035) x 87:287:2
=1135=1135 x 8
\(a)\dfrac{3}{4}-\dfrac{2}{7}=\dfrac{21-8}{28}=\dfrac{13}{28}.\\ b)\dfrac{3}{8}-\dfrac{5}{16}=\dfrac{6-5}{16}=\dfrac{1}{16}.\)
\(c)\dfrac{7}{5}-\dfrac{2}{3}=\dfrac{21-10}{15}=\dfrac{11}{15}.\\ d)\dfrac{31}{36}-\dfrac{5}{6}=\dfrac{31-30}{36}=\dfrac{1}{36}.\)
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