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\(\frac{3}{18}+\frac{1}{18}=\frac{4}{18}=\frac{2}{9}\)hình tròn
Ta chọn phương án A
Đáp án :
a) \(135+\left(-2\right).14-135+28\)
\(=135+\left(-28\right)-135+28\)
\(=135-28-135+28\)
\(=135-135+28-28=0\)
b) \(-18.2+18.\left(-6\right)+\left(-18\right).3\)
\(=18.\left(2+6+3\right)=18.11=198\)
a) \(135+\left(-2\right)\cdot14-135+28\)
\(=135+\left(-28\right)-135+28\)
\(=\left(135-135\right)+\left[\left(-28\right)+28\right]\)
\(=0+0\)
\(=0\)
b) \(-18\cdot2+18\cdot\left(-6\right)+\left(-18\right)\cdot3\)
\(=-18\cdot2+\left(-18\right).6+\left(-18\right).3\)
\(=-18\cdot\left(2+6+3\right)\)
\(=-18\cdot11\)
\(=-198\)
\(a)135+\left(-2\right).14-135+28\)
\(=135+\left(-28\right)-135+28\)
\(=135-135+\left(-28\right)+28\)
\(=0+0\)
\(=0\)
\(b)\left(-18\right).2+18.\left(-6\right)+\left(-18\right).3\)
\(=\left(-36\right)+\left(-108\right)+\left(-54\right)\)
\(=\left(-144\right)+\left(-54\right)\)
\(=\left(-198\right)\)
a, \(\dfrac{7}{18}x-\dfrac{2}{3}=\dfrac{5}{18}\)
\(\dfrac{7}{18}x=\dfrac{5}{18}+\dfrac{2}{3}\)
\(\dfrac{7}{18}x=\dfrac{17}{18}\)
\(x=\dfrac{17}{18}\div\dfrac{7}{18}\)
\(x=\dfrac{17}{7}\)
a) \(\dfrac{7}{18}\).x-\(\dfrac{2}{3}\)=\(\dfrac{5}{18}\)
\(\dfrac{7}{18}\).x =\(\dfrac{5}{18}\)+\(\dfrac{2}{3}\)
\(\dfrac{7}{18}\).x = \(\dfrac{17}{18}\)
x = \(\dfrac{17}{18}\) :\(\dfrac{7}{18}\)
x =\(\dfrac{17}{7}\)
b)\(\dfrac{4}{9}\) - \(\dfrac{7}{8}\).x =\(\dfrac{-2}{3}\)
\(\dfrac{7}{8}\).x =\(\dfrac{4}{9}\)-\(\dfrac{-2}{3}\)
\(\dfrac{7}{8}\).x =\(\dfrac{10}{9}\)
x =\(\dfrac{10}{9}\) : \(\dfrac{7}{8}\)
x =\(\dfrac{80}{63}\)
c)\(\dfrac{1}{6}\)+\(\dfrac{-5}{7}\): \(\dfrac{-7}{18}\)
\(\dfrac{1}{6}\)+\(\dfrac{90}{49}\)
\(\dfrac{589}{294}\)
\(=\frac{2^{18}.2^7.3^{14}.3^3+3^{15}.2^{15}}{2^{10}.2^{15}.3^{15}+3^{14}.3.5.2^{26}}=\frac{2^{25}.3^{17}+3^{15}.2^{15}}{2^{25}.3^{15}+3^{15}.2^{26}.5}=\frac{2^{15}.3^{15}\left(2^{10}.3^2+1\right)}{2^{25}.3^{15}\left(1+2.5\right)}\)
\(=\frac{2^{10}.3^2+1}{2^{10}\left(1+2.5\right)}=\frac{2^{10}.3^2+1}{11.2^{10}}\)
a) 2^27=(2^3)^9=8^9
3^18=(3^2)^9=9^9
Vì 8^9 bé hơn 9^9 nên 2^27 bé hơn 3^18
\(-18.2+18.\left(-6\right)+\left(-18\right).3\)
\(=-18.2+\left(-18\right).6+\left(-18\right).3\)
\(=-18.\left(2+6+3\right)\)
\(=-18.11\)
\(=-198\)
-18.2+(-18).6+(-18).3
=-18.(2+6+3)
=-18.12
= ..... ( tự tính nha )