a)19

b)202

c)34

d)-20

e)-23

Nếu minh trả lời đúng thì cho nhé

A , -28+15+32=19

B,

A) -28 + | - 15 | + 32

   = -28 + 15 + 32

   = -13 + 32

   = 19

B) 356 - | - 73| + (-81)

   = 356 - 73 + (-81)

    = 283 + (-81)

    = 283 - 81

    = 202

C) |-56| + 56 + (-78)

   = 56 + 56 + (-78)

   = 56 x 2 + (-78)

   = 112 + (-78)

   = 112 - 78

    = 34

D) (-56 + 73) + |37|

   = (73 - 56) + 37

   = 17 + 37

    = 54

E) |-28| : |4| + (-16)

    = 28 : 4 + (-16)

     = 7 + (-16)

     = 7 - 16

    = -9

 x - (28 - x) = x - 24x−(28−x)=x−24.

d.160 - (2³ . 5² - 9 . 5²)

=160 - ( 8 . 25 - 9. 25)

= 160 - {25.(8-9)}

= 160 - {25.(-1)}

= 160 - (-25)

= 185

a. 72 + 56 + 28

=(72+28)+56

=100+56

=156

b.27,145 - 27,44 - 27

=-0,295-27

=-27,295

c. -9756 + (2015 + 9756)

=-9756+2015+9756

=(-9756+9756)+2015

=0+2015

=2015

d.160 - (2³ . 5² - 9 . 5²)

=160-(8*5²-9*5²)

=160-[(8-9)*25]

=160-(-25)

=185

a. 72 + 56 + 28

= (72 + 28) + 56

= 100 + 56

= 156

a) 67 +135 + 33 = (67 + 33) +135 = 100 +135 - 235.

b) 56 + (47 + 44) = (56+44) + 47 = 100 + 47 = 147.

c)146 +121+54 + 379 = (146 + 54) + (121+379)

= 200 + 500 = 700.

d) 27 +132 + 237 + 868 + 763 = (237 + 763) + (132 + 868) + 27

= 1000 +1000 + 27 = 2027.

e) 22 + 23 + 24 +... + 27 + 28 = (22 + 28) + (23 + 27) + (24 + 26) + 25

= 50 + 50 + 50 + 25 = 175

Sao mấy phép tính này là lớp 6 vậy??? Mấy phép tính này dễ mà!

a) 67 +135 + 33 = (67 + 33) +135 = 100 +135 - 235.

b) 56 + (47 + 44) = (56+44) + 47 = 100 + 47 = 147.

c)146 +121+54 + 379 = (146 + 54) + (121+379)

= 200 + 500 = 700.

d) 27 +132 + 237 + 868 + 763 = (237 + 763) + (132 + 868) + 27

= 1000 +1000 + 27 = 2027.

e) 22 + 23 + 24 +... + 27 + 28 = (22 + 28) + (23 + 27) + (24 + 26) + 25

= 50 + 50 + 50 + 25 = 175

Sao mấy phép tính này mà lại là lớp 6 vậy....?

a,91-5(5+x)=61

=>25+5x=91-61=30

=>5x=30-25=5

=>x=1

b,\([\left(x+34\right)-50]\)x2=56

=>(x+34)-50=56:2=28

=>x+34=28+50=78

=>x=78-34=44.

c,1045-\([2015-\left(3x-24\right)]\)=5

=>2015-(3x-24)=1045-5=1040

=>3x-24=2015-1040=975

=>3x=975+24=999

=>x=999:3=333

d,\([195-\left(3x-27\right)]\)x39=4212

=>195-(3x-27)=4212:39=108

=>3x-27=195-108=87

=>3x=87+27=117

=>x=39

e,30-3(x-2)=18

=>30-3x+6=18

=>30-3x=18-6=12

=>3x=30-12=18

=>x=18:3=6

a) \(...\Rightarrow5\left(5+x\right)=91-61=30\)

\(\Rightarrow\left(5+x\right)=30:5=6\Rightarrow x=6-5=1\)

b) \(...\Rightarrow\left(x+34\right)-50=56:2=28\)

\(\Rightarrow\left(x+34\right)=28+50=78\Rightarrow x=78-34=44\)

c) \(...\Rightarrow2015-\left(3x-24\right)=1045-5=1040\)

\(\Rightarrow\left(3x-24\right)=2015-1040=975\)

\(\Rightarrow3x=975+24=999\Rightarrow x=999:3=333\)

d) \(...\Rightarrow195-\left(3x-27\right)=4212:39=108\)

\(\Rightarrow\left(3x-27\right)=195-108=87\)

\(\Rightarrow3x=87+27=114\Rightarrow x=114:3=38\)

e) \(...\Rightarrow3\left(x-2\right)=30-18=12\Rightarrow x-2=12:3=4\)

\(\Rightarrow x=4+2=6\)

1: =66+34-73-27+99=99

2: =54-45+30-54-30+5=-40

3: =42-56+33-33+56-42=0

4: =50-47-50+18+47-18=0

5: =10-28+30-4=2-4+10=12-4=8

\(\text{1.-(-66)+34+(-73)-27+99}.\)

\(=66+34-73-27+99=100-100+99=-99.\)

\(\text{2.54-(45-30+54)-30+5}.\)

\(54-45+30-54-30+5=\left(54-54\right)+\left(-45+5\right)+\left(30-30\right)=-40.\)

\(\text{3.42-56+33-(33-56+42)}.\)

\(=42-56+33-33+56-42=\left(42-42\right)+\left(-56+56\right)+\left(33-33\right)=0.\)

\(\text{4.50-(47+50-18)+(47-18)}.\)

\(=50-47-50+18+47-18=\left(50-50\right)+\left(-47+47\right)+\left(18-18\right)=0.\)

\(\text{5.10-(28-30+4)}.\)

\(=10-28+30-4=10+30-20-8-4=20-12=8.\)

\(\text{6.-(-73)+(44-94+27)+94}.\)

\(=73+44-94+27+94=\left(73+27\right)+\left(-94+94\right)+44=100+44=144.\)

a) \(58+7x=100\)

\(=>7x=100-58\)

\(=>7x=42\)

\(=>x=42:7\)

\(=>x=6\)

b) \(3x-7=28\)

\(=>3x=28+7\)

\(=>3x=35\)

\(=>x=35:3\)

\(=>x=\dfrac{35}{3}\)

c) \(x-56:4=16\)

\(=>x-14=16\)

\(=>x=16+14\)

\(=>x=30\)

d) \(101+\left(36-4x\right)=105\)

\(=>36-4x=105-101\)

\(=>36-4x=4\)

\(=>4x=36-4\)

\(=>4x=32\)

\(=>x=32:4\)

\(=>x=8\)

e) \(\left(x-12\right):12=12\)

\(=>x-12=12.12\)

\(=>x-12=144\)

\(=>x=144-12\)

\(=>x=132\)

f) \(\left(3x-2^4\right).7^3=2.7^4\)

\(=>3x-2^4=2.7^4:7^3\)

\(=>3x-16=2.7=14\)

\(=>3x=14+16\)

\(=>3x=30\)

\(=>x=30:3\)

\(=>x=10\)

i) \(\left(10+2x\right).4^{2011}=4^{2013}\)

\(=>10+2x=4^{2013}:4^{2011}\)

\(=>10+2x=4^2=16\)

\(=>2x=16-10\)

\(=>2x=6\)

\(=>x=6:2\)

\(=>x=3\)

\(#WendyDang\)