Câu 1 : Thực hiện các phép tonhs sau một cách hợp lí :
a, 21 .41 + 21 . 59 + 79 . 23 + 79 . 77
b, 28 . 76 + 24 . 28 - 28 . 20
c, 56 . 73 + 73 . 44 - 730
\(d,80-\left(4.5^2-3.2^3\right)\)
\(e,\left(-12\right)+83+\left(-48\right)-\left(-17\right)\)
g, 12 + ( -2 - 2 ) - ( 28 - 24 + 12 )
1. Tinh Gia Tri Bieu Thuc :
a) ( 120 - 12 x 5 ) : 6
b) 494 - ( 75 + 35 : 5 ) x 2
c) 1/4 + ( 3/4 : 1/2 ) x 5/6
d) ( 360 - 15 x 6 ) : 5
giup mik nhanh nhe
a) 3/13 + 7/12 - 10/13 + 5/12 | d) -5/10 + 12/28 - 3/27 - 7/18 + 20/35 |
b) 15/24 - 6/26 + 28/48 - 30/39 + 10/24 | e) 1/56 + 1/72 + 1/90 + 1/110 + 1/132+ 1/156 = |
c) -1/2 + 3/7 - 1/9 - 7/18 + 4/7 = |
tinh gia tri bieu thuc:
a)159:157+59:254-28*43
b)125+1470:{437-[135+(72*2-25*3)3]}
Tính hợp lý:
45-58+(-45)+(+58)-3
(-57)-(-12)+3-(-57)
-(-24)-(-30)+(-24)-30+8
-(-12)+(+19)-(+12)+8-19
47-(-53)+(-47)-(+53)
-(+28)+32-(-28)+(-34)
15-(+72)+(-15)+(+72)
20-(+46)+(-25)-(-46)
28-(-32)+(-28)-32+5
-75+(-49)+(+75)+49-12
Giúp e vs ạ
-10/3 + 13/10-1/6+7/10
1-20/6 +39/30-4/24+34/50
15/24-6/26+28/48-30/39+10/24
-5/10+12/28-3/27-7/18+20/35
tinh gia tri bieu thuc : A=3+3^2+3^3+3^4....3^100
hay giup minh cau nay kho qua !
TÍNH HỢP LÍ:
1. 35 . 18 - 5 . 7 . 28
2. 45 - 5 . ( 12 + 9 )
3. 24 . ( 16 - 5 ) - 16 . ( 24 - 5 )
4. 29 . ( 19 - 13 ) - 19 . ( 29 - 13 )
5. 31 . ( - 18 ) + 31 . ( - 81 ) - 31
6. ( - 12 ) . 47 + ( - 12 ) . 52 + ( - 12 )
7. 13 . ( 23 + 22 ) - 3 . ( 17 + 28 )
8. - 48 + 48 . ( - 78 ) + 48 . ( - 21 )
. là dấu nhân
a) 2×24×25+3×41×16+6×2×8×17
b)15×360+15×2×27+1500
c)47×63+53×21+47×37+53
d)2×169×12-3×68×8-24
e)2×56×24-3×36×16+4×12×95-6×3×8×5
f)(36×15×169)÷(5×18×13)
h)(112+2×28-5×28)÷28
i)1448-(448+500)