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15.{32:[6-5+5(9:3)]}
=15.{32:[1+5.3]}
=15.{32:[1+15]}
=15.{32:16}
=15.2
=30
81. (27 + 915) : ( 35 + 332)
= 81 . (33 +(32)15) :(35 + 332)
= 34 . (33 + 32.15) :(35 + 332)
= 32 .(32 . (33 + 330) :(35 + 332)
= 9 .(32 . 33 + 32 . 330) : (35 + 332)
= 9 . (35 + 332) : (35 + 332)
= 9 . 1
= 9
a)\(\left(-3\right).8.\left(-2\right).5=\left(-3\right).\left(-2\right).8.5\)
\(=6.40=240\)
b)\(127-18.\left(5+6\right)=127-18.11\)
\(=127-198=-71\)
c)\(125-\left(-75\right)+32-\left(48+32\right)=125+75+32-48-32\)
\(\left(125+75\right)+\left(32-32\right)-48=200-48=152\)
d)\(3.\left(-4\right).2+2.\left(-5\right)-20=-12.2+2.\left(-5\right)-20\)
\(=\left(-12-5\right).2-20=-17.2-20=-140-20=-160\)
Chúc bạn học tốt
\(3^{^{ }2}\) . 5 + 23.10 - 81: 3
= 9.5 + 8.10 - 27
= 45 + 80 - 27
= 125 - 27
= 98
\(3^2\cdot5+2^3\cdot10-81:3\)
\(=9\cdot5+8\cdot10-3^4:3\)
\(=40+80-3^3\)
\(=120-27\)
\(=93\)
28 - ( -32 ) + ( -28 ) - 32 + 5
= 28 + 32 + ( -28 ) - 32 + 5
= ( -28 + 28 ) + ( -32 + 32 ) + 5
= 0 + 0 + 5
= 5
\(621-\left\{\left[\left(117+3\right):5\right]-9\right\}\)
\(=621-\left\{\left[120:5\right]-9\right\}\)
\(=621-\left\{24-9\right\}\)
\(=621-15\)
\(=606\)
a: \(2\cdot25\cdot4\cdot50\)
\(=\left(2\cdot50\right)\cdot\left(25\cdot4\right)\)
\(=100\cdot100=10000\)
b: \(\left(-125\right)\cdot5\cdot\left(-16\right)\cdot\left(-8\right)\)
\(=-125\cdot5\cdot16\cdot8\)
\(=-\left(125\cdot8\right)\cdot\left(5\cdot16\right)\)
\(=-80\cdot1000=-80000\)
c: \(5^2\cdot3^3\cdot2\)
\(=25\cdot27\cdot2\)
\(=\left(25\cdot2\right)\cdot27=27\cdot50=1350\)
d: \(\left(-4\right)\cdot3^2\left(-5\right)^3\)
\(=\left(-4\right)\cdot\left(-125\right)\cdot9\)
\(=500\cdot9=4500\)
\(=621-15=606\)