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a: =35/17-18/17-9/5+4/5
=1-1=0
b: =-7/19(3/17+8/11-1)
=7/19*18/187=126/3553
c: =26/15-11/15-17/3-6/13
=1-6/13-17/3
=7/13-17/3=-200/39
\(4^2\cdot120-4^3\cdot17+4^2\cdot34\)
\(=4^2\left(120-4\cdot17+34\right)\)
\(=16\left(120-68+34\right)\)
\(=16\cdot86=1088\)
\(a,\)\(\frac{2^5\times3^{12}\times7^8}{2^7\times3^{10}\times7^9}=\frac{3^2\times\left(2^5\times3^{10}\times7^8\right)}{2^2\times7\times\left(2^5\times3^{10}\times7^8\right)}\)\(=\frac{3^2}{2^2\times7}=\frac{9}{28}\)
\(b,\)Tương tự
\(\left(11\times3^{22}\times3^7-9^{15}\right)\div6^{28}=\left[11\times3^{29}-\left(3^2\right)^{15}\right]\div\left(2\times3\right)^{28}=\left(11\times3^{29}-3^{30}\right)\div\left(2^{28}\times3^{28}\right)\)
\(=\frac{3^{29}\times\left(11-3\right)}{2^{28}\times3^{28}}=\frac{3\times8}{2^{28}}=\frac{3\times2^3}{2^{28}}=\frac{3}{2^{25}}\)
3: \(=20-12-8+12=20-8=12\)
5: \(=-18-42-21-35=-116\)
3: \(=-15+18-12+8=-27+26=-1\)
2: \(=-12+21-15+10=9-5=4\)
2) -3(4 - 7) + 5(-3 + 2)
= -3.4 + 3.7 - 5.3 + 5.2
= -12 + 21 -15 + 10
= 31 - 27
= 4
4) -5(2 - 7) + 4(2 - 5)
= -5.2 + 5.7 + 4.2 - 4.5
= -10 + 35 + 8 - 20
= 38 - 30
= 8
\(9.3^7:3^6=9.3=27\)
\(9\cdot3^7:3^6=3^2\cdot3^7:3^6=3^{2+7-6}=3^3=27\)