Câu hỏi của Lý Thị Hoài Thương

Question

Tính hợp lý (nếu có thể)a) A = (217+172).(915 – 330 ).(24 – 322)  b) B =(28.83) : (25.23) c) C = 644.165 : 420

ILoveMath · Accepted Answer

$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$ Câu trả lời: $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$

Nguyễn Lê Phước Thịnh · Answer

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: $C=2^{24}\cdot2^{20}:2^{40}=2^4=16$Câu trả lời: 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: $C=2^{24}\cdot2^{20}:2^{40}=2^4=16$

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