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=100;(250;[450-(22.52-22.52)])
=100;(250;450)=100;(5/9)=180
nhớ **** nha
2−3+5−[−12+5−(−3+7)−12]+322−3+5−[−12+5−(−3+7)−12]+32
=2−8−[−7−4−12]+32=2−8−[−7−4−12]+32
=2−8+23+32=2−8+23+32
=2−63=2−63
=−61
= 81 . 32 + 81 . 45 + 27 . 69
= 81 . 32 + 81 . 45 + 27 ( 3 . 23 )
= 81 . 32 + 81 . 45 + ( 27 . 3) .23
= 81 . 32 + 81 . 45 + 81 . 23
= 81 . ( 32 + 45 +23 )
= 81 . 100
= 8100
a) \(26+173+74+27\)
\(=\left(26+74\right)+\left(173+27\right)\)
\(=100+200\)
\(=300\)
b) \(75\cdot37+89\cdot46+75\cdot52-89\cdot21\)
\(=75\cdot\left(37+52\right)+89\cdot\left(46-21\right)\)
\(=75\cdot89+89\cdot25\)
\(=89\cdot\left(75+25\right)\)
\(=89\cdot100\)
\(=8900\)
c) \(2^7:2^2+5^4:5^3\cdot2^4-3\cdot2^5\)
\(=2^{7-2}+5^{4-3}\cdot2^4-3\cdot2^5\)
\(=2^5+5\cdot2^4-3\cdot2^5\)
\(=2^4\cdot\left(2+5-3\cdot2\right)\)
\(=2^4\cdot\left(7-6\right)\)
\(=2^4\)
\(=16\)
d) \(100:\left\{250:\left[450-\left(4\cdot5^3-2^2\cdot25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(4\cdot5^3-4\cdot5^2\right)\right]\right\}\)
\(=100:\left[250:\left(450-4\cdot5^2\cdot4\right)\right]\)
\(=100:\left[250:\left(450-400\right)\right]\)
\(=100:\left(250:50\right)\)
\(=100:5\)
\(=20\)
\(=182\cdot32+182\cdot68=182\cdot100=18200\)