1.=545.(65+15-80)

=545.0

=0

2.=100:{250:[450-(4.125-4.25)]}

   =100:{250:[450-4.(125-25)]}

   =100:{250:[450-4.100]}

   =100:{250:50}

   =100:5

   =20

1. 545.65 + 545.15 - 80.445

= 545(65+15)-80.445

= 545.80-80.445

= 80.(545-445)

= 80.100

= 8000

=100;(250;[450-(2².5²-2².5²)])

=100;(250;450)=100;(5/9)=180

nhớ **** nha

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) \(100:\left\{250:\left[450-\left(4\cdot5^3-2^2\cdot25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(4\cdot5^3-4\cdot5^2\right)\right]\right\}\)

\(=100:\left[250:\left(450-4\cdot5^2\cdot4\right)\right]\)

\(=100:\left[250:\left(450-400\right)\right]\)

\(=100:\left(250:50\right)\)

\(=100:5\)

\(=20\)

a,714+382+286+318

\(=\left(714+286\right)+\left(382+318\right)\)

\(=1000+700\)

= \(1700\)

b,18.73+15.18+12.18

\(=18.\left(73+15+12\right)\)

\(=18.100\)

\(=1800\)

c,(37+63) : {250:[450-(4.5^3-2^2.25)]}

\(=100:\left\{250:\left[450-\left(2^2.125-2^2.25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(2^2.\left(125-25\right)\right)\right]\right\}\)

\(=100:\left\{250:\left[450-400\right]\right\}\)

\(=100:\left\{250:50\right\}\)

\(=100:5\\ =20\)

CHÚC BANJ HỌC TỐT!!

a) 714+382+286+318

=(714+286)+(382+318)

=1000+700

=1700

b) 18.73+15.18+12.18

=18.(73+15+12)

=18.100

=1800

c) (37+63):{250:[450-(4.5^3-2^2.25)]}

=100:{250:[450-(4.125-4.25)]}

=100:{250:[450-4.(125-25)]}

=100:{250:[450-4.100]}

=100:{250:[450-400]}

=100:{250:50}

=100:5

=20

-Chúc bạn học tốt-

\(=100:\left\{250\left[450-\left(4\cdot125-4\cdot25\right)\right]\right\}\\ =100:\left[250\left(450-400\right)\right]\\ =100:\left(250\cdot50\right)=100:12500=12,5\)

100 : { 250 [ 450 - ( 4.5^3 - 2^2 .25) ]} = 12,5

=100:{250.[450-(4.125-4.25)]}

=100:{250:[450-400]}

=100:{250:50}

=100:5

=20

\(180:\left\{300:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}\\ =180:\left\{300:\left[450-\left(4.125-4.25\right)\right]\right\}\\ =180:\left\{300:\left[450-\left(500-100\right)\right]\right\}\\ =180:\left\{300:\left[450-400\right]\right\}\\ =180:\left\{300:50\right\}\\ =180:6\\ =30\)

\(180:\left\{300:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}\\ =180:\left\{300:\left[450-\left(4.125-4.25\right)\right]\right\}\\ =180:\left\{300:\left[450-\left(4.100\right)\right]\right\}\\ =180:\left\{300:\left[450-400\right]\right\}\\ =180:\left\{300:50\right\}\\ =180:6\\ =30\)

100:{250:[450-(4.5³-2².25)}]

=100:{250:[450-(500-100)]}

=100:{250:[450-400]}

=100:{250:50}

=100:5

=20

  100:{250:[450-(4.5^3-2^2.25)]}

=100:{250:[450-(4.125-4.25)]}

=100:{250:[450-(500-100)]}

=100:{250:[450-400]}

=100:{250:50}

=100:5

=20

                             ~Chúc học tốt!~

\(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}\)

= \(100:\left\{250:\left[450-\left(2^2.5^3-2^2.5^2\right)\right]\right\}\)

= \(100:\left\{250:\left[450-2^2.5^2\left(5-1\right)\right]\right\}\)

= \(100:\left[250:\left(450-100.4\right)\right]\)

=\(100:\left(250:50\right)\)

= \(100:5\)

= \(20\)