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\(2^3\cdot5^3-3\left\{400-\left[673-2^3(7^8:7^6+7^0)\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-8(7^{8-6}+7^0)\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-8(7^2+7^0)\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-8(49+1)\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-8\cdot50\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-400\right]\right\}\)
\(=8\cdot125-3\left\{400-273\right\}\)
\(=8\cdot125-3\cdot127\)
\(=619\)
\(2^3.5^3-3\left\{400-\left[673-2^3\left(7^8:7^6+7^0\right)\right]\right\}\)
\(=8.125-3\left\{400-\left[673-8\left(49+1\right)\right]\right\}\)
\(=1000-3\left\{400-\left[673-8.50\right]\right\}\)
\(=1000-3\left\{400-\left[673-400\right]\right\}\)
\(=1000-3\left\{400-273\right\}\)
\(=1000-3.\left(127\right)\)
\(=1000-381\)
\(=619\)
\(b,2^3x5^3-3x\left\{400-\left[673-2^3x\left(7^8:7^6+7^0\right)\right]\right\}\)
\(=1000-3x\left\{400-\left[673-8x\left(7^2+1\right)\right]\right\}\)
\(=1000-3x\left\{400-\left[673-8x50\right]\right\}\)
\(=1000-3x\left\{400-\left[673-400\right]\right\}\)
\(=1000-3x\left\{400-273\right\}\)
\(=1000-3x127\)
\(=1000-381\)
\(=619\)
\(a,1968:16+5136:16-704:16\)
\(=\left(1968+5136-704\right):16\)
\(=6400:16\)
\(=400\)
1
3\(^5\).5\(^3\)-20.{300-[546-2\(^3\).(7\(^8\):7\(^6\)+7\(^0\))]}
= 243.125-20.{300-[546-8.(49+1)
= 243.125-20.[300-(546-8.50)
= 243.125-20.[300-(546-400)
= 243.125-20.(300-146)
= 243.125-20.154
= 30375-3080
= 27295
b) 3^2 . [(5^2 - 3 ) : 11 ] - 2^4 + 2.10^3
= 9 . [(25 - 3 ) : 11 ] - 16 + 2.1000
= 9 . [22 : 11 ] - 16 + 2000
= 9 . 2 - 16 + 2000
= 18 - 16 + 2000
= 2 + 2000
= 2002
(72005 + 72004) : 72004
= 72005 : 72004 + 72004 : 72004
= 72005 - 2004 + 1
= 71 + 1
= 7 + 1
= 8
a) ( 3^5 . 3^7 ) : 3^10 + 5.2^4 - 7^3 : 7
= 3^10 : 3^10 + 80 - 7^2
= 1 + 80 - 49
= 32
32 . 53 - 20{300 - [540 - 23 (78 : 76 + 70)]}
= 9 . 125 - 20{300 - [540 - 8(72 + 70)]}
= 9 . 125 - 20{300 - [540 - 8(49 + 1)]
= 9 . 125 - 20{300 - [540 - 8.50]
= 9 . 125 - 20{300 - [540 - 400]}
= 9 . 125 - 20{300 - 140}
= 9 . 125 - 20. 160
= 1125 - 3200 = -2075
\(=9\cdot125-20\cdot\left\{300-\left[540-8\cdot\left(7^2+1\right)\right]\right\}\)
\(=1125-20\cdot\left\{300-\left[540-8\cdot\left(49+1\right)\right]\right\}\)
\(=1125-20\cdot\left[300-\left(540-8\cdot50\right)\right]\)
\(=1125-20\cdot\left[300-\left(540-400\right)\right]\)
\(=1125-20\cdot\left(300-140\right)\)
\(=1125-20\cdot160\)
\(=1125-3200\)
\(=-2075\)
(57+ 75).(68+86).(24-42)
=(57+ 75).(68+86).(24-24)
=(57+ 75).(68+86).0
= 0
chúc e hc tốt
\(3^8:3^4=3^{8-4}=3^4\)
\(10^8:10^2=10^{8-2}=10^6\)
\(a^6:a=a^6:a^1=a^{6-1}=a^5\)
\(2^{10}:2^8=2^{10-8}=2^2\)
\(2^{10}:2^8=1024:256=4\)
tương tự
23 . 25 - 3 { 400 - [ 673 - 23 ( 78 : 76 +70)]}
= 28 - 3 { 400 - [ 673 - 8 ( 72 +1 )]}
= 256 - 3 { 400 - [ 673 - 8 . 50 ]}
= 256 - 3 { 400 - [ 673 - 400 ]}
= 256 - 3 { 400 - 273 }
= 256 - 3 . 127
= 256 - 381
= - 125
bằng 619 mới đúng nhé