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a) \(\left(-28\right).\left(-3\right).\left(+4\right).\left(-7\right)=\left(+84\right).\left(+4\right).\left(-7\right)=\left(+336\right).\left(-7\right)=\left(-2352\right)\)
b) \(2.8.\left(-14\right).\left(-3\right)=16.\left(-14\right).\left(-3\right)=\left(-224\right).\left(-3\right)=672\)
\(\frac{2^{30}.9^8}{6^2.8^6}\) =\(\frac{2^8.9^8.2^{32}}{\left(2.3\right)^2.\left(2^3\right)^6}\) =\(\frac{2^{10}.\left(3^2\right)^8}{3^2}\) =\(2^{10}.9^7\)
\(\left\{\left[3^{14}.69+12.3^{14}\right]:3^{16}-7\right\}:2^4\)
\(=\left\{\left[3^{14}.\left(69+12\right)\right]:3^{16}-7\right\}:16\)
\(=\left\{\left[3^{14}.81\right]:3^{16}-7\right\}:16\)
\(=\left\{\left[3^{14}.3^4\right]:3^{16}-7\right\}:16\)
\(=\left\{3^{18}:3^{16}-7\right\}:16\)
\(=\left\{3^2-7\right\}:16\)
\(=\left\{9-7\right\}:16\)
\(=2:16\)
\(=\frac{1}{8}\)
\(\frac{7.9-14}{3-17}=\frac{63-14}{3-17}=\frac{49}{-14}=\frac{-49}{14}\)\(=\frac{-7}{2}\)
\(a,\frac{7.9-14}{3-17}=\frac{63-14}{3-17}=\frac{49}{-14}=\frac{-49}{14}=\frac{-7}{2}\)
TK MÌNH NHE!
CHÚC HỌC TỐT
7 x 9 - 14 / 3 - 17
= ( 7 x 9 ) - ( 14 / 3 ) - 17
= 63 - 14/3 - 17
= 124/3
zzz chúc học giỏi zzz
\(14:\left(4\frac{1}{2}-2\frac{5}{8}\right)+14.\frac{1}{4}.\frac{2}{3}\)
\(=14:\frac{15}{8}+14.\frac{1}{6}\)
\(=14.\frac{8}{15}+14.\frac{1}{6}\)
\(=14.\left(\frac{8}{15}+\frac{1}{6}\right)\)
\(=14.\frac{7}{10}\)
\(=\frac{98}{10}\)
đúng thì ủng hộ nha
\(14\div\left(4\frac{1}{2}-2\frac{5}{8}\right)+14\times\frac{1}{4}\times\frac{2}{3}=14\div\left(\frac{9}{2}-\frac{21}{8}\right)+14\times\frac{1}{4}\times\frac{2}{3}\)
\(=14\div\frac{15}{8}+14\times\frac{1}{4}\times\frac{2}{3}\)
\(=\frac{112}{15}+\frac{7}{3}\)
\(=\frac{49}{5}\)
CHÚC BẠN HỌC TỐT
\(\frac{11.3^{22}.3^7-9^{15}}{\left(3^{14}\right)^2}\)
\(=\frac{11.3^{29}-3^{30}}{3^{28}}\)
\(=\frac{3^{29}.\left(11-3\right)}{3^{28}}\)
\(=3.8=24\)
\(\frac{11.3^{22}.3^7-9^{15}}{ \left(3^{14}\right)^2}\)
= \(\frac{11.3.3^{21}.3^7-\left(3^2\right)^{15}}{\left(3^{14}\right)^2}\)
= \(\frac{33.3^{28}-3^{30}}{3^{28}}\)
= \(\frac{33.3^{28}-3^{28}.9}{3^{28}}\)
= \(\frac{3^{28}.\left(33-9\right)}{3^{28}}\)
= \(\frac{24}{1}=24\)
2.8.(-14).(-3) = (2.8).[(-14).(-3)]
= 16.42 = 672