35 + 25 = 60
Bài 1  : Tính ( tính nhanh nếu có thể )
a, 594 + 40638 + 32947 – 40000
=  41232 + 32947 – 40000
= 74179 – 40000
= 34179
b, 20 + 21 + 22 + .... + 29 + 30
= ( 20 + 30  ) + ( 21 + 29 ) + ( 22 + 28 ) + ( 23 + 27 ) + ( 24 + 26 ) + 25
=        50        +         50       +        50        +         50       +        50       + 25
=  50 x 5 + 25
=     250  + 25
=            275
c, 64 x 25 + 35 x 25 + 25
= 64 x 25 + 35 x 25 + 25 x 1
=   25 x ( 64 + 35 + 1 )
=  25 x        100
=    2500
d, 58 x 42 x 32 x 8 + 5 x 16
= 2436 x 256 + 80
= 623616 + 80
= 623696
e, ( 42 x 43 + 43 x 57 + 43 ) – 360 : 4
=   (  42 x 43 + 43 x 57 + 43 x 1 ) – 90
=   43 x ( 42 + 57 + 1 ) – 90
= 43 x 100 – 90
= 4300 – 90
= 4210
42 + 20 = 62
          Chúc bạn học tốt nhé ! ^^

a)2500

b)2772

c)1974

d)347

e)1874

k mk nha

a,25x100=2500

b,

a. 64 x 25 + 35 x 25 + 25

= 64 x 25 + 35 x 25 + 25 x 1

= 25 x ( 64 + 35 + 1 )

= 25 x 100 

= 2500

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

c. ( 42 x 43 + 57 x 43 + 43 ) - 360 : 4

= 42 x 43 + 57 x 43 + 43 x 1 - 90

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

= 43 x 100 - 90

= 4300 - 90

= 4210

d. 456 : 2 x 181456 : 3 - 102

Trả lời:

a,\(64\times25+35\times25+25\)

\(=25\times\left(64+35+1\right)\)

\(=25\times100\)

\(=2500\)

b,\(58\times42+32\times8+5\times16\)

\(=2436+256+80\)

\(=2772\)

c,\(\left(42\times43+57\times43+43\right)-360\div4\)

\(=43\times\left(42+57+1\right)-90\)

\(=43\times100-90\)

\(=4300-90\)

\(=4210\)

d,\(456\div2\times181456\div3-102\)

\(=228\div3\times181456-102\)

\(=76\times181456-102\)

\(=13790656-102\)

\(=13790554\)

a)64x25+35x25+25=25x(64+35)+25=25x99+25=2475+25=2500

mình trả lời ý a

64 x 25 +35 x 25 +25 x 1

= 25 x ( 64 + 35 + 1 )
= 25 x 100

= 2500

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

???