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Câu 1:
\(A=\frac{2^5.7+2^5}{2^5.3-2^5}\)= \(\frac{2^5.8}{2^5.2}\)= 4
Vậy A = 4
Câu 2:
\(B=2^3.5^3-3.\left\{400-\left[673-2^3.\left(7^8:7^6+7^0\right)\right]\right\}\)
\(B=8.125-3.\left\{400-\left[673-8.\left(7^2+1\right)\right]\right\}\)
\(B=1000-3.\left\{400-\left[673-8.\left(49+1\right)\right]\right\}\)
\(B=1000-3.\left\{400-\left[673-8.50\right]\right\}\)
\(B=1000-3.\left\{400-\left[673-400\right]\right\}\)
\(B=1000-3.\left\{400-273\right\}\)
\(B=1000-3.127\)
\(B=1000-381\)
\(B=619\)
Vậy B = 619
12000 - ( 1500 . 2 + 1800 . 3 + 1800 . 2 : 3 )
= 12000 - ( 3000 + 5400 + 3600 : 3 )
= 12000 - ( 3000 + 5400 + 1200 )
= 12000 - 9600
= 2400
12 000 - (1500 . 2 + 1800 . 3 + 1800 . 2 : 3)
=12 000 - (3000 + 5400 + 3600 : 3)
= 12 000 - (3000 + 5400 + 1200)
= 12 000 - 9600 = 2400
\(a)-129+\left[4^2\cdot5-(-7)\right]:3\)
\(=-129+\left[16\cdot5-(-7)\right]:3\)
\(=-129+\left[16\cdot5+7\right]:3\)
\(=-129+\left[80+7\right]:3\)
\(=-129+\frac{87}{3}\)
\(=-129+29=-100\)
\(b)-(-2014-879)+\left[1136+(-2014)\right]\)
\(=(2014+879)+\left[1136-2014\right]\)
\(=2893+(-878)\)
\(=2893-878=2015\)
\(\text{Câu 2 : Tìm số nguyên x biết :}\)
\(a)(\left|x\right|+3):5-3=12\)
\(\Rightarrow(\left|x\right|+3):5=12+3\)
\(\Rightarrow(\left|x\right|+3):5=15\)
\(\Rightarrow(\left|x\right|+3)=15\cdot5\)
\(\Rightarrow(\left|x\right|+3)=75\)
\(\Rightarrow\left|x\right|=75-3\)
\(\Rightarrow\left|x\right|=72\)
\(\Rightarrow x\in\left\{72;-72\right\}\)
\(b)\frac{86}{2(2x-1)^2-7}+4^2=2\cdot3^2\)
\(\Rightarrow\frac{86}{2(2x-1)^2-7}+16=2\cdot9\)
\(\Rightarrow\frac{86}{2(2x-1)^2-7}+16=18\)
\(\Rightarrow\frac{86}{8x^2-8x-5}=18-16\)
\(\Rightarrow\frac{86}{8x^2-8x-5}=2\)
....
\(\text{Còn nốt bạn tự làm nhé :3}\)
\(-129+\left[4^2\cdot5-\left(-7\right)\right]:3\)
\(=-129+\left[80+7\right]:3\)
\(=-129+29\)
\(=-100\)
A) 400 + { 106 - [ 23 + ( 4.23 - 6.5 )]}
= 400 + { 106 - [ 8 + ( 4.8 - 30 )]}
= 400 + { 106 - [ 8 + ( 32 - 30 )]}
= 400 + { 106 - [ 8 + 2 ]}
= 400 + { 106 - 10 }
= 400 + 96
= 496
B) 800 : { 111 - [ 32 + ( 23 .5 - 19.2 )]}
= 800 : { 111 - [ 9 + ( 8.5 - 38 )]}
= 800 : { 111 - [ 9 + ( 40 - 38 )]}
= 800 : { 111 - [ 9 + 2 ]
= 800 : { 111 - 11 }
= 800 : 100
= 8
\(A,400+\left\{106-\left\{2^3+\left(4.2^3-6.5\right)\right\}\right\}\)
\(A,=400+\left\{106-\left\{8+\left(4.8-6.5\right)\right\}\right\}\)
\(A,=400+\left\{106-\left\{8+\left(32-30\right)\right\}\right\}\)
\(A,=400+\left\{106-\left(8+2\right)\right\}\)
\(A,=400+\left(106-10\right)\)
\(A,=400+96\)
\(A,=496\)
\(B,800:\left\{111-\left\{3^2+\left(2^3.5-19.2.\right)\right\}\right\}\)
\(B,=800:\left\{111-\left\{9+\left(8.5-19.2\right)\right\}\right\}\)
\(B,=800:\left\{111-\left\{9+\left(40-38\right)\right\}\right\}\)
\(B,=800:\left\{111-\left(9+2\right)\right\}\)
\(B,=800:\left(111-11\right)\)
\(B,=800:100\)
\(B,=8\)