nhầm

x=5

y=5

cho mình 5 sao nhé

ko bao giờ

Bằng 2 nha bạn

cho mình 5 sao nhé

A=1-2+3-4+5-6+...+47-48+49-50

   =[-1+(-1)]x25

   =-50

cho mình 5 sao nha

=80

a,$x$ + (-5) = -18

    x           =-18-(-5)

    x           =-13

b) 541 + ( 218 - $x$) = 235

               (218-x)  =235-541

               (218-x)  =-306

                   x  =218-(-306)

                    x =524

a,

=21.(843+157)

=21000

b

=((-215)+215)+43-23

=0+20

=20

a,53.25−25.12+75.53

=53.(25+75)-25.12

=53.100-25.12

=5300-300

=5000

b,260:[5+7.(72:2³-6)]-3²

$=260:\left[5+7.\left(72:8-6\right)\right]-9$

$=260:\left[5+7.3\right]-9$

$=260:26-9$

$=10-9$

$=1$

a,36+75+64+25+99

=(36+64)+(75+25)+99

=100+100+99

=299

b,2 024\(^0\)
+3.[5
\(^2\).10−(23−13)\(^2\)
]

=1+3.[25.10-100]

=1+3.150

=450

c,4\(^{^{ }2}\).65+35.4\(^2\)-1500

=16.65+35.16-1500

=16.(65+35)-1500

=16.100-1500

=100