644.165:420
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\(a,A=\left(2^{17}+17^2\right)\left(9^{15}-3^{30}\right).\left(2^4-32^2\right)\)
\(\Rightarrow A=\left(2^{17}+17^2\right)\left(3^{30}-3^{30}\right).\left(2^4-32^2\right)\)
\(\Rightarrow A=\left(2^{17}+17^2\right).0.\left(2^4-32^2\right)\)
\(\Rightarrow A=0.\)
\(\Rightarrow B=\left(2^8.8^3\right):\left(2^5.2^3\right)\)
\(\Rightarrow B=\left(2^8.2^9\right):\left(2^5.2^3\right)\)
\(\Rightarrow B=2^{17}:2^8\)
\(\Rightarrow B=2^9\)
\(\Rightarrow B=512\)
\(c,C=64^4.16^5:4^{20}\)
\(\Rightarrow C=2^{24}.2^{20}:2^{40}\)
\(\Rightarrow C=2^4\)
\(\Rightarrow C=16\)
a: \(A=\left(2^{17}+17^2\right)\cdot\left(2^4-32^2\right)\cdot\left(3^{30}-3^{30}\right)=0\)
b: \(B=\dfrac{2^8\cdot2^9}{2^5\cdot2^3}=2^9\)
c: \(C=2^{24}\cdot2^{20}:2^{40}=2^4=16\)
420 x 3 + 420 + 420 x 4 + 420 x 2
= 420 x ( 3 + 4 + 2 ) + 420
= 420 x 9 + 420
= 5880 + 420
= 6300
Mọi người k cho mình nha!
420 x 3 + 420 + 420 x 4 + 420 x 2 =
420 x 3 + 420 x 4 + 420 x 2 + 420 x 1 =
420 x (3 + 4 + 2 + 1 ) =
420 x 10 =
4200
tk cho mình nha
(- 4) . (+21) . (- 25) . (- 2)
= (-4).(-25).(+21).(-2)
= 100.(+21).(-2)
= -4200
Đáp án: C
Bài làm:
\(\frac{215}{300}=\frac{43}{60}\)
\(\frac{1200}{2010}=\frac{40}{67}\)
\(\frac{105}{420}=\frac{1}{4}\)
\(\frac{125}{420}=\frac{25}{84}\)
#Học_tốt
\(\dfrac{215}{300}\) = \(\dfrac{215:5}{300:5}\) = \(\dfrac{43}{60}\)
\(\dfrac{1200}{2010}\) = \(\dfrac{1200:30}{2010:30}\) = \(\dfrac{40}{67}\)
\(\dfrac{105}{420}\) = \(\dfrac{105:105}{420:105}\) = \(\dfrac{1}{4}\)
\(\dfrac{125}{420}\) = \(\dfrac{125:5}{420:5}\) = \(\dfrac{25}{84}\)
a: \(125^5:25^3=5^{15}:5^6=5^9\)
b: \(27^6:9^3=3^{18}:3^6=3^{12}\)
c: \(4^{20}:2^{15}=2^{40}:2^{15}=2^{45}\)
d: \(24^n:2^{2n}=24^n:4^n=6^n\)
e: \(64^4\cdot16^5:4^{20}=2^{24}\cdot2^{20}:2^{40}=2^4\)
Theo quy tắc của dấu ngoặc,ta có:
516+320+357+5000+612-(516+320)-(5000+357+612)+(-420)+(-580)
= 516+320+357+5000+612-516-320-5000-357-612+(-420)+(-580)
= (516-516)+(320-320)+(357-357)+(5000-5000)+(612-612)+(-420)+(-580)
= 0 + 0 + 0 + 0 + 0 + (-420)+(-580)
= 0 + 0 + 0 + 0 + (-420)+(-580)
= 0 + 0 + 0 + (-420)+(-580)
= 0 + 0 + (-420)+(-580)
= 0 + ((-420)+(-580))
= 0 + -1000
= -1000
644 . 165 : 420
= 412 . 410 : 420
= 412 + 10 - 20
= 42
= 16