Bài 5 :\(a,\left(8576-535\right)-8576\)

\(=8576-535-8576\)

\(=\left(8576-8576\right)-535\)

\(=0-535\)

\(=-535\)

\(b,\left(-7105\right)-\left(155-7105\right)\)

\(=-7105-155+7105\)

\(=\left(-7105+7105\right)-155\)

\(=0-155\)

\(=-155\)

\(c,8715+\left(1345+8715\right)\)

\(=8715+1345+8715\)

\(=8715\times2+1345\)

\(=17430+1345\)

\(=18775\)

\(d,\left(35-815\right)-\left(795-65\right)\)

\(=35-815-795+65\)

\(=\left(35+65\right)-\left(815+795\right)\)

\(=100-1610\)

\(=-1510\)

Bài 6 : \(a,25-\left(30+x\right)=x-\left(27-8\right)\)

                    \(25-30-x=x-19\)

                              \(-x-x=-19-25+30\)

                                    \(-2x=-14\)

                                          \(x=7\)

\(b,\left(x-2\right)-15=\left(20-7\right)-\left(18+x\right)\)

         \(x-2-15=13-18-x\)

                    \(x+x=13-18+2+15\)

                          \(2x=12\)

                             \(x=6\)

1. a, (8576 + (-536)) - 8576

= 8576 - 536 - 8576

= -536

b, (-7105) - (155 - 7105)

= -7105 - 155 + 7105

= -155

c,-8715+ (1345 + 8715)

= -8715 + 1345 + 8715

= 1345

d,(35 - 815) - (795 - 65)

= 35 - 815 - 795 + 65

= ( 35 + 65 ) + (-815 - 795)

= 100 - 1610

= -1510

e,f, bạn làm tương tự nhé!

Bài 2:a, / a - 2/ = 0

       a - 2 = 0

       a = 2

b, bạn ghi sai đề rồi

-3758+(1345+8715)

=-3758+10060

=6302

(35-815)-(795-65)

= 35-815-795+65

=35+(-815)+(-795)+65

=(36+65)+[(-815)+(-795)]

=   100   +     (-1610)

=      (-1510)

3758+57-3759-66

=3758+57+(-3759)+(-66)

=[3758+(-3759]+[57+(-66)]

=     (-1)          +   (-9)

=                (-10)

55+66+57+58-35-36-37-38

=(55-35)+(66-36)+(57-37)+(58-38)

=   20   +    30   +   20   +   20

=  (20+20+20)+30

=           90

tính máy tính thì có biết máy tính giải kiểu gì đâu , nó chỉ cho kết quả thôi

6302

-1510

-10

90

(8576-535)-8576

=8576-8576-535

=0-535

=-535

( 8576 - 535 ) - 8576

= 8576 - 8576 - 535

= 0 - 535 =  -535

( 8576 - 535 ) - 8576

= ( 8576 - 8576 ) - 535

=  0 - 535

= - 535

OK ~

`@` `\text {Ans}`

`\downarrow`

`35-815-(795-65)`

`= 35-815-795+65`

`= (35+65)+(-815-795)`

`= 100-1610`

`= -1510`

\(=35-815-795+65\\ =\left(35+65\right)-\left(815+795\right)\\ =100-1610\\ =-1510\)

=-780-730

=-1510

= -1510 

bạn nhé !!!

(35-815)-(795-65)

= - 780 - 730

= -1510

\(\left(35-815\right)-\left(795-65\right)\)

\(=-150-730\)

\(=-880\)

a. -34 + 16 + 34 + 7

= [ ( -34 ) + 34 ] + ( 16 + 7 )

= 0 + 23

= 23

b. 17 + ( -35 ) + ( - 37 ) + 35

= [ ( -35 ) + 35 ] + [ ( -37) + 17 ]

= 0 + ( -20 )

= ( -20 )

c. 3157 + 57 - 3159 - 66

( 3157 - 3159 ) + ( 57 - 66 )

= (-2) + ( -9 )

= (-11)

d. 8715 + (-1250) + 56 - 250

7465 + 56 - 250

= 7521 - 250

= 7271

a) \(-34+16+34+7\)

\(=\left(-34+34\right)+\left(16+7\right)\)

= \(0+23=23\)

b) \(17+\left(-35\right)+\left(-37\right)+35\)

\(=\left(-37+17\right)+(-35+35)\)

\(=-20+0=-20\)

c) 3157+57-3159-66

= (3157-3159)+(57-66)

= (-2) + (-9)

= -11

d) 8715+(-1250)+56-250

= (8715+56)+(-1250-250)

= 8771-1500

=7271

bài 1

a)-7105-(155-7105)+355
 =-7105 -155 +7105 +355
 =(-7105 + 7105)+(-155 + 355)

 =0 + 200

=200
 

b)(35−815)−(795−65)b)(35-815)-(795-65)

=−780−730=-780-730

=−1510

$a\left)\right(-7105)-(155-7105)+355$

$=(-7105)-155+7105+335$

$=\left[\right(-7105)+7105]+(355-155)$

$=0+200$

$=200$

$b\left)\right(35-815)-(795-65)$

$=35-815-795+65$

$=(35+65)+\left[\right(-815)-795]$

$=100+(-1610)$

$=-1510$

c)5−197−2015−2015c)5−197−2015−2015

=(5−197)+[(−2015)−2015]=(5−197)+[(−2015)−2015]

=(−192)+(−4330)=(−192)+(−4330)

=−4522=−4522

d)4567+1234−4567−(−66)d)4567+1234−4567−(−66)

=(4567−4567)+[1234−(−66)]=(4567−4567)+[1234−(−66)]

=0+1300=0+1300

=1300
 

e)2004−15+54−2004−54e)2004−15+54−2004−54

=(2004−2004)+(54−54)−15=(2004−2004)+(54−54)−15

=0+0−15=0+0−15

=−15
 

g)1259−1409−12+1259+1409g)1259−1409−12+1259+1409

=(1259+1259)+(1409−1409)−12=(1259+1259)+(1409−1409)−12

=2518+0−12=2518+0−12

=2506