Tính nhanh: 35.34 + 35,86 + 65.75 + 65.45.
Tính nhanh:
a) 23.56 + 56.77;
b) 32.19 + 32;
c) 35.34 + 35,86 + 65.75 + 65.45;
d) 43.17 + 29.57 + 13.43 + 57;
e) 3.25.8+4.37.6 + 2.38.12
f) 64.16+81.84+17.16
a) 23.56 + 56.77 = (23 + 77).56 = 100.56 = 5600.
b) 32.19 + 32 = 32.(19 +1) = 32.20 = 640.
c) 35.34 + 35.86 + 65.75 + 65.45 = 35.(34 + 86) + 65.(75 + 45)
= 120.35+120.65 -120.(35 + 65) = 12000.
d) 43.17 + 29.57 +13.43 + 57 = 43.(17 +13) + 57.(29 +1)
= 43.30 + 57.30 = 30. (43+57) = 3000.
e) 3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400.
f) 64.16 + 81.84+17.16 = 16.(64+17)+81.84 = 16.81+81.84
= 81.(16 + 84) = 8100
Tính nhanh:
a) 23.56 + 56.77;
b) 32.19 + 32;
c) 35.34 + 35,86 + 65.75 + 65.45;
d) 43.17 + 29.57 + 13.43 + 57;
e) 3.25.8+4.37.6 + 2.38.12
f) 64.16+81.84+17.16
a) 23.56 + 56.77 = (23 + 77).56 = 100.56 = 5600.
b) 32.19 + 32 = 32.(19 +1) = 32.20 = 640.
c) 35.34 + 35.86 + 65.75 + 65.45 = 35.(34 + 86) + 65.(75 + 45)
= 120.35+120.65 -120.(35 + 65) = 12000.
d) 43.17 + 29.57 +13.43 + 57 = 43.(17 +13) + 57.(29 +1)
= 43.30 + 57.30 = 30. (43+57) = 3000.
e) 3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400.
f) 64.16 + 81.84+17.16 = 16.(64+17)+81.84 = 16.81+81.84
= 81.(16 + 84) = 8100
Tính hợp lí:
35.34 + 35.56 + 65.75 + 65.45
= 35.(34+56+75+45)
= 35. 210
= 7350
$35.34 + 35.56 + 65.75 + 65.45$
$=35.(34+56)+65.(75+45)$
$=35.90+65.120$
$=3150+7800$
$=10950$
Tính nhanh:
35.34+35.38+65.75+65.45
Giải:
\(35.34+35.38+65.75+65.45\)
\(=35\left(34+38\right)+65\left(75+45\right)\)
\(=35.72+65.120\)
\(=2520+7800\)
\(=10320\)
Chúc bạn học tốt!
Bài 1 . Tính nhanh
35 . 34 + 35 . 38 + 65 . 75 + 65 + 45
= 35 . ( 34 + 38 ) + 65 . ( 75 + 45 )
= 35 . 72 + 65 . 120
= 2 520 + 7 800
= 10 320
35 . 34 + 35 . 38 + 65 . 75 + 65 . 45
= 35 . ( 34 + 38 ) + 65 . ( 75 + 45 )
= 35 . 72 + 65 . 120
= 2520 + 7800
= 10 320
Tính nhanh:
35.34+35.38+65.75+65.45
( Ai nhanh mình tick cho )
35.34+35.38+65.75+65.45
=35(34+38)+65.(75+45)
=35.72+65.120
=2520+7800
=10320
TÍNH NHANH
a, 35.34+35.86+65.75+65.45
b, 21.72-11.72+90.72+49.125.16
A,35*34+35*86+65*75+65*45
=35*[34+86]+65*[75+45]
=35*100+65*120
=35*100+65*100+65*20
=[35+65]*100+65*20
=10000+1300=11300
Thực hiện phép tính (Hợp lý nếu có thể) :
a) 35.34 + 35.86 + 65.75 + 65.45
a) 35.34 + 35.86 + 65.75 + 65.45 =
( 35 + 65 ) x ( 34 + 86 ) + ( 75 + 45 )
100 x 120 x 120
100 x 14400
1440000
\(35\cdot34+35\cdot86+65\cdot75+65\cdot45\\ =35\cdot\left(34+86\right)+65\cdot\left(75+45\right)\\ =35\cdot120+65\cdot120\\ =120\cdot\left(35+65\right)\\ =120\cdot100\\ =12000\)
35.34+38.35.38+65.75+65.45
35.34+35.38+65.75+65.45
35.34+35.38+65.75+65.45
=35.(34+38)+65.(75+45)
=35.72+65.120
=2520+7800
=10320
35.34+35.38+65.75+65.45
=35(34+38)+65(75+45)
=35.72+65.120=2520+7800=10320