a, 456 : 2 x 18 + 456 : 3 - 102

= 228 x 18 + 152 - 102

= 4104 + 50

= 4154

a) 4154

b) 2772

a. 456 : 2 x 18 + 456 : 3 - 102

= 228 x 18 + 152 - 102

= 4104 + 152 - 102

= 4104 + 50

= 4154

b, 58 x 42 + 32 x 8 + 5 x 16

= 2436 +  256 + 80

= 2772

bài 3 : tính nhanh

a) (42*43+43*57+43)-360:4

ngoặc vuông43.(42+57+1) ngoặc vuông -90

43.100-90

4300-90

4210

b.

a) (42*43 + 43*57 + 43) - 360:4

= 43*(42+57+1) - 90

= 43*100 - 90

= 4300 - 90

= 3410

a) (42*43+43*57+43)-360:4

= 43. (42+ 57 +1) - 90

= 43 .100 - 90

= 4300 - 90 =4210

b) hình như đề sai 

c) 58*42+32*8+5+16

=58. 42 + 2.16 . 8 + 5+16

= 58 . 21.2 + 16 . (2.8 + 5)

= 58 . 21 . 2 + 16 . 21

= 21 . (58 .2 + 16)

= 21 . 132

= 2771

*HỌC TỐT*

TK NHÉ, B   ÊU ^^

đề sao đây bn

\(456:218+456:3-102\)

\(=456:221-102\)

\(=-\dfrac{22086}{221}\)

`@` `\text {Ans}`

`\downarrow`

`456 \div 2 \times 18 + 456 \div 3 - 102`

`= 456 \times 1/2 \times 18 + 456 \times 1/3 - 102`

`= 456 \times (1/2 \times 18 + 1/3) - 102`

`= 456 \times ( 9 + 1/3) - 102`

`= 456 \times 28/3 - 102`

`= 4256 - 102`

`= 4154`

456 : 2 x 18 + 456 : 3 - 102

= 4104 + 50

= 4154

   456 : 2 \(\times\) 18 + 456 : 3 - 102

= 228 \(\times\) 18 + 152 - 102

= 4104 + 152 - 102

= 4256 - 102

= 4154

Bài 6:

\(21,251+6,058+0,749+1,042\)

\(=\left(21,251+0,749\right)+\left(6,058+1,042\right)\)

\(=22+7,1\)

\(=29,1\)

___________________

\(1,53+5,309+12,47+5,691\)

\(=\left(1,53+12,47\right)+\left(5,309+5,691\right)\)

\(=14+11\)

\(=25\)

5:

a: =>x/17=5/17

=>x=5

b; =>6+x=7/11*33=21

=>x=15

c: \(\dfrac{12+x}{43-x}=\dfrac{2}{3}\)

=>3x+36=86-2x

=>5x=50

=>x=10

d: \(\dfrac{x}{5}< \dfrac{3}{7}\)

=>x<3/7*5

=>x<15/7

f: 15/26+x/16=46/52

=>x/16=23/26-15/26=8/26=4/13

=>x=4/13*16=64/13

nhầm , thoy để tính luôn z :

456/2*18+456/3-102

= 4104 + 456/3 - 102 

=4256-102

=4154

456 : 2 *18 +456 :3 -102 =228*18+ 152 - 102 =4104+50=4154

456:2*18+456:3-102=228 * 18+152-102

=4104+50

=4154

    456:2 x 18 + 456  :3 - 102

= 228 x 18 + 152 - 102

= 4104 + 50 = 4154

456 : 2 x 18 + 456 : 3 - 102 

= ( 456 : 2 x 18 ) + ( 456 :3 ) - 102 

= ( 228 x 18 ) + 152 - 102 

= 4104 + 152 - 102

= 4256 - 102

= 4154 

chúc bn học tốt . mk ko biết đúng hay sai tại vì là mk tính nhẩm .

`@` `\text {Ans}`

`\downarrow`

`456 \div2\times18 + 456\div3 - 102`

`= 456\times0,5\times18 + 456\times1/3 - 102`

`= 456\times (0,5 \times 18 + 1/3) - 102`

`= 456 \times(9 + 1/3) - 102`

`= 456 \times28/3 - 102`

`= 4256 - 102`

`= 4154`

=456*9+456:3-102

=4104+152-102

=4104+40

=4144