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YẾN ƠI TUI BẠN BÀ NÈ
NHƯNG TUI HỔNG PHẢI LỚP 6 THÔNG CẢM NHA
\(2^3\cdot5^3-3\left\{400-\left[673-2^3(7^8:7^6+7^0)\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-8(7^{8-6}+7^0)\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-8(7^2+7^0)\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-8(49+1)\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-8\cdot50\right]\right\}\)
\(=8\cdot125-3\left\{400-\left[673-400\right]\right\}\)
\(=8\cdot125-3\left\{400-273\right\}\)
\(=8\cdot125-3\cdot127\)
\(=619\)
\(2^3.5^3-3\left\{400-\left[673-2^3\left(7^8:7^6+7^0\right)\right]\right\}\)
\(=8.125-3\left\{400-\left[673-8\left(49+1\right)\right]\right\}\)
\(=1000-3\left\{400-\left[673-8.50\right]\right\}\)
\(=1000-3\left\{400-\left[673-400\right]\right\}\)
\(=1000-3\left\{400-273\right\}\)
\(=1000-3.\left(127\right)\)
\(=1000-381\)
\(=619\)
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
\(b,2^3x5^3-3x\left\{400-\left[673-2^3x\left(7^8:7^6+7^0\right)\right]\right\}\)
\(=1000-3x\left\{400-\left[673-8x\left(7^2+1\right)\right]\right\}\)
\(=1000-3x\left\{400-\left[673-8x50\right]\right\}\)
\(=1000-3x\left\{400-\left[673-400\right]\right\}\)
\(=1000-3x\left\{400-273\right\}\)
\(=1000-3x127\)
\(=1000-381\)
\(=619\)
\(a,1968:16+5136:16-704:16\)
\(=\left(1968+5136-704\right):16\)
\(=6400:16\)
\(=400\)