a) 11070 : {15 . [ 356 – ( 2110 – 2000 )]}

= 11070 : [15(356 – 110)] = 11070 : 3690 = 3

11070:15.[356-(2110-2000)]

=11070:15.[356-110]

=11070:15.246

=738.246

=181548

181548 ko chac

a) 11070 : {15 . [ 356 – ( 2110 – 2000 )]}

= 11070 : [15(356 – 110)] = 11070 : 3690 = 3

b) 62500 : { 50 2  : [ 112 – ( 52 –  2 3 . 5 )]}

= 62500 : { 2500 : [ 112 – ( 52 – 40 )]}

= 62500 : { 2500 : [ 112 – 12 ]}

= 62500 : { 2500 : 100 }

= 62500 : 25

= 2500

c)  3 3  .  5 3  – 20 . { 300 – [ 540 –  2 3  (  7 8  :  7 6  +  7 0  )]}

=  3 3  .  5 3  – 20 . {300 – [ 540 –  2 3 (72 + 1 )]

=  3 3  .  5 3  – 20 . [ 300 – (540 - 8 . 50)

= 27 . 125 – 20 . [300 – ( 540 - 400 )]

= 3375 – 20 . ( 300 – 140 )

= 3375 – 20 . 160

= 3375 – 3200

= 175

a: \(A=38\cdot66-38\cdot56+62\cdot65-62\cdot55\)

\(=38\cdot\left(66-56\right)+62\left(65-55\right)\)

\(=38\cdot10+62\cdot10=10\cdot100=1000\)

b: \(B=11070:15\cdot\left\lbrack356-\left(2021-2011\right)\right\rbrack\)

\(=738\cdot\left\lbrack356-10\right\rbrack=738\cdot346=255348\)

c: C=2015+[(44+2-8):2]

=2015+[(44-6):2]

=2015+38:2

=2015+19

=2034

d: \(D=31:\left\lbrace330:\left\lbrack178-4\cdot\left(35-21:3\right)\right\rbrack\right\rbrace\)

\(=31:\left\lbrace330:\left\lbrack178-4\cdot\left(35-7\right)\right\rbrack\right\rbrace\)

=31:{330:[178-4*28]}

=31:{330:66}

=31:5

=6,2

f: \(F=3597\cdot34+3597\cdot65+3597\)

\(=3597\cdot\left(34+65+1\right)\)

\(=3597\cdot100=359700\)

Làm từng bước ra là biết mà :)

\(110700:15\cdot\left[365-\left(2110-2000\right)\right]\\ =110700:15\cdot\left[365-110\right]\\ =110700:15\cdot255\\ =7380\cdot255\\ =1881900\)

Cách 1 làm đúng nè nhưng mà tính sai, cách 2 sai thứ tự thực hiện phép tính.

\(a,11070:\left\{15.\left[356-\left(2110-2000\right)\right]\right\}\)

\(=11070:\left[15.\left(356-110\right)\right]\)

\(=11070:\left(15.246\right)\)

\(=11070:3690\)

\(=3\)

\(b,62500:\left\{50^2:\left[112-\left(52-2^3.5\right)\right]\right\}\)

\(=62500:\left\{50^2:\left[112-\left(52-40\right)\right]\right\}\)

\(=62500:\left[50^2:\left(112-12\right)\right]\)

\(=62500:\left(50^2:100\right)\)

\(=62500:25\)

\(=2500\)

Đáp án C

400dm2 = 4cm2

2110m2 = 21,1dm2

15m2 = 150000cm2

10dm2 2cm2 = 1002cm2

400 dm2 = 40000 cm2     2110 m2 = 211000 dm2      

15 m2 = 150000 cm2      10 dm2 2 cm2 = 1002 cm2

k mik nha! 

Chúc bạn học tốt!

150000 cm²

10300 dm²

211000 cm²

5 dm²

\(15m^2=150000cm^2\)

\(103m^2=10300dm^2\)

\(2110dm^2=211000cm^2\)

\(500cm^2=5dm^2\)