tính nhanh :
-33 x ( 57 - 64 ) - 57 x ( -33 + 64 )
Tính nhanh :
a ) 43 x 27 + 93 x 43 + 57 x 61 x 59 x 57
b ) 64 x 6 + 81 x 4 + 17 x 6
43 x 27 + 93 x 43 + 57 x 61 + 59 x 57
= 43 x ( 27 + 93 ) + 57 x ( 61 + 59 )
= 43 x 120 + 57 x 120
= 120 x ( 43 + 57 )
= 120 x 100
= 1200
b) 64 x 6 + 81 x 4 + 17 x 6
= 6 x ( 64 + 17 ) + 81 x 4
= 6 x 81 + 81 x 4
= 81 x ( 6 + 4 )
= 81 x 10
= 810
A) =43 x (27+93)+57*(61+59)
=43*120+57*120
=120*(43+57)
=120*100
=12000
Tính nhanh:(chỉ có 5 phút để trả lời)
42 + 43 + 44 + 45 - 32 - 33 - 34 - 35
(64+ 65+ 66+ 67+ 68) - (54 + 55 + 56 + 57 + 58)
42 + 43 + 44 + 45 - 32 - 33 - 34 - 35
= (42 - 32)+(43 - 33)+(44 - 34)+(45 - 35)
= 10+10+10+10
= 40
(64+65+66+67+68) - (54+55+56+57+58)
= 64+65+66+67+68 - 54-55-56-57-58
= (64 - 54)+(65 - 55) +(66 - 56) + (67- 57) + (68 -58)
= 10+10+10+10+10
= 50
câu 1 40
câu 2 50
nha
Tính nhanh:
36.(146+57)+64.(143+57)
Tính nhanh :
36 . ( 146 + 57 ) + 64 . ( 143 + 57 )
36. (146+57) +64 . 200
36.203+64.200
7308+12800
=20108
36 . ( 146 + 57 ) + 64 . ( 143 + 57 )
= 36 . 146 + 57 + 64 . 143 + 57
= 36 . 146 + 143 + 57
= 36 . ( 146 + 143 + 1 )
= 36 . 290
= 10440
Tính bằng hai cách:
a) 93 x 8 + 93 x 2
b) 36 x 9 + 64 x 9
c) 57 x 8 – 57 x 7
\(a,C1=744+186\\ =930\\ C2=93\times\left(8+2\right)\\ =93\times10=930\\ b,C1:=324+576\\ =900\\ C2=9\times\left(36+64\right)\\ =9\times100\\ =900\\ c,C1=456-399\\ =57\\ C2=57\times\left(8-7\right)\\ =57\)
\(a)\)\(93\times8+93\times2\)
\(=98\times\left(8+2\right)\)
\(=98\times10\)
\(=980\)
\(b)36\times9+64\times9\)
\(=9\times\left(36+64\right)\)
\(=9\times100\)
\(=900\)
\(c)57\times8+57\times7\)
\(=57\times\left(8-7\right)\)
\(=57\times1\)
\(=57\)
Bài 1 : Đặt tính rồi tính :
49 x 28, 57 x 36, 64 x 45, 75 x 28, 79 x 34, 1692 : 47, 2538 : 54, 3792 : 79, 4067 : 83, 2484: 69 .
làm nhanh nhé, ai nhanh, đúng rõ, thì mk k nghe !
Tính nhanh: 31/30+43/42+57/56+64/63+...+381/380.
tinh nhanh
a) (100 + 67) x 67 + (200 – 33) x 33
b) 45,651 x 73 + 45,651 x 20 + 45,651 x 7
c) 14,2 x 30 + 14,2 x 57 + 14,2 x 13
a) \(\left(100+67\right).67+\left(200-33\right).33\)
\(=167.67+167.33\)
\(=167.\left(67+33\right)\)
\(=167.100\)
\(=16700\)
b) \(45,651.73+45,651.20+45,651.7\)
\(=45,651.\left(73+20+7\right)\)
\(=45,651.100\)
\(=4565,1\)
c) \(14,2.30+14,2.57+14,2.13\)
\(=14,2.\left(30+57+13\right)\)
\(=14,2.100\)
\(=1420\)
_Chúc bạn học tốt_
Tính nhanh:
a) 64 x 25 + 35 x 25 + 25
b) 58 x 42 + 32 x 8 + 5 x 16
c) ( 42 x 43 + 57 x 43 + 43 ) - 360 : 4
d) 456 : 2 x 181456 : 3 - 102
* Nhanh lên nhé *
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,64 x 25 + 35 x 25 +25
=25x(64+35+1)
=25x100
=250
b, 58 x 42 +32 x 8 +5 x 16
=2772
c,(42 x 43 +57 x 43+43 )-360:4
=43x(42+57+1) - 360 :4
= 43 x 100 -90
=4300-90
=4210
d,456:2 x 181456:3 -102
=228x181456:3-102
=13790656-102
=13790554