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

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

180 : { 300 : [ 450 - ( 4 . 5³ - 2² . 25 )]}

= 180 : { 300 : [ 450 - ( 4 . 125 - 4 . 25 )]}

= 180 : { 300 : [ 450 - ( 500 - 100 )]}

= 180 : { 300 : 50 }

= 180 : 6

= 30

180: ( 300: ( 450 - (4 x 5³ - 2²x 25)))

=180: ( 300: ( 450 - ( 500 - 100 )))

=180: ( 300: ( 450 - 400 ))

=180: ( 300: 50)

\(a,3^3+3^2-\left(2^7:2^5+7^8:7^7\right)=27+9-\left(2^2+7\right)=36-11=25\)

\(b,27.77+27.27-27=27\left(77+27-1\right)=27.103=2781\)

\(c,52:\left(43-30\right)+144-16=52:13+128=4+128=132\)

\(f,3^2.101-3^2.101^0=3^2\left(101-101^0\right)=9\left(101-1\right)=9.100=900\)

a.=27+9-(2^2+7^1)                                                 =36-(4+7)                                                               =36-11                                                                   =25

3³+3²-(2⁷:2⁵+7⁸:7⁷)

=27+9-(2²+7)

=36-(4+7)

=36-11

=25

b.bạn tự lm nha

c.52:(43-30)+144-16

=52:13+144-16

=4+144-16

=148-16

=132

d.174:{2[36+(4²-23)]}

=174:{2[36+(16-23)]}

=174:{2[36+-7]}

=174:{2.29}

=174:58

=3

x + 300 = 450 + 450

x + 300 = 900

x          = 900 - 300

x          = 600

x = 600

tk mk nha bn

thanks

x=600

k mk nha

a) 450 – ( 25 – 10) = 450 – 15

                   = 435

450 – 25 – 10 = 425 – 10

                   = 415

b) 180 : 6 : 2 = 30 : 6

                   = 15

180 : ( 6 : 2 ) = 180 : 3

                   = 60

c) 410 – (50 +30) = 410 -80

                   = 330

410 - 50 + 30 = 360 + 30

                   = 390

d) 16 x (6 : 3) = 16 x 2

                   = 32

16 x 6 : 3 = 96 : 3

                   = 32

x là dấu .

\(a,245-96+6\)

\(=155\)

\(b,=23\times\left(65+35\right)\)- 360

\(=23\times100-360\)

\(=1940\)

\(c,3^3+3^2-\left(2^2+7\right)\)

\(3^3+3^2-\left(4+7\right)\)

=\(3^3+3^2-11\)

=\(27+9-11\)

a,245 - 12.8 + 18:3

=155

b,23.65+23.35-360

=23.(65+35) -360

=2300 - 360=1940

c,3³+3²-(2⁷:2⁵+7⁸:7⁷)

=3³+3² 

Lời giải:

$M=\frac{4-1}{1\times 4}+\frac{7-4}{4\times 7}+\frac{10-7}{7\times 10}+....+\frac{22-19}{19\times 22}+\frac{25-22}{22\times 25}$

$=1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+....+\frac{1}{22}-\frac{1}{25}$

$=1-\frac{1}{25}=\frac{24}{25}$

x+450=600+180

x+450=780

x=780-450

x=330

x + 450 = 600 + 180

x + 450 = 780

x = 780 - 450

x = 330

x=330 đó