a=38,27*2,5+23,45*19-0,54*1,25+19*1,55
*là dấu nhân
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A = 38,27 x 2,5 + 23,45 x 19 - 1,25 + 19 x 1,55
A = 95,675 + 445,55 - 1,25 + 29,45
A = 569,425
\(\text{a)4,38-19+0,62}\)\(=-14\)
\(b.3,45-5,7+8,55=6,3\)
\(c.14,7+\left(-8,4\right)+\left(-4,7\right)=1.6\)
2.
\(a,-2,4-\left(0,54-2,5\right)=-0,44\)
\(b,-25,4-\left(5,54-2,5\right)=-28,44\)
\(c.2,15-\left(-0,6+0,12\right)=2.63\)
a, \(\frac{2}{3}\).\(\frac{15}{17}\)+\(\frac{2}{3}\).\(\frac{2}{17}\)
= \(\frac{2}{3}\).( \(\frac{15}{17}\)+ \(\frac{2}{17}\))
= \(\frac{2}{3}\). 1
=\(\frac{2}{3}\)
b,\(\frac{20}{19}\):\(\frac{3}{7}\)- \(\frac{1}{19}\): \(\frac{3}{7}\)
= ,\(\frac{20}{19}\).\(\frac{7}{3}\)- \(\frac{1}{19}\).\(\frac{7}{3}\)
= \(\frac{7}{3}\).(\(\frac{20}{19}\)-\(\frac{1}{19}\))
=\(\frac{7}{3}\).1
=\(\frac{7}{3}\)
A. \(\frac{2}{3}.\frac{15}{17}+\frac{2}{3}.\frac{2}{17}\)
=\(\frac{2}{3}.\left(\frac{15}{17}+\frac{2}{17}\right)\)
=\(\frac{2}{3}.1\)
=\(\frac{2}{3}\)
B. \(\frac{20}{19}:\frac{3}{7}-\frac{1}{19}:\frac{3}{7}\)
=\(\left(\frac{20}{19}-\frac{1}{19}\right):\frac{3}{7}\)
=1:\(\frac{3}{7}\)
=\(\frac{7}{3}\)
a=570
k nha