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-

=(-37).(-381)-14134

=14097-14134

=-37

=-37

-37

\(=-37+37.382-382.37=-37\)

7x=721

x=103

\(\Leftrightarrow7x=714+7=721\\ \Leftrightarrow x=\dfrac{721}{7}=103\)

Đáp án/:

X = 103

382*8+2*382

=382*(8+2)

=382*10

=3820

382*8+2*382=382*(8+2)

                  =382*10

                  =3820

x × 34 = 714

x = 714 : 34

x = 21

714 - x : 2 : 6 = 28

714 - x : 12 = 28

x : 12 = 714 - 28

x : 12 = 686

x = 686 x 12

x = 8232

Ủng hộ mk nha ^_-

46- (16+714:15)-2

= 46-(16+47,6)-2

= 46-63,6-2

=-19.6

số đó à 

-2

mình chỉ chắc thế

thôi chứ đề bài hình như 

bn chép sai