-23+[82-(-15-17)]
=-23+[82-(-32)]
=-23+114
=91
-23+[82-(-15-17)]
= -23 + [ 82 - ( -15 - 17 ) ]
= -23 + [ 82 - ( -32 ) ]
= -23 + 114
= 91
a)15×17-15/15×16+10
b)23×29-10/23×28+13
c)75×8+25/75×82-50
d)53+153×156/153×157-100
Bài 1: Thực hiện phép tính
1) 17 . 85 + 15 . 17 – 120
| 9)
|
2) 23 . 17 – 23 . 14 | 10) |
3) 20 + | 11) 5871: {928 -[(-82) +247) ].5} |
4) 28.76+23.28 -28.13 | 12) 112:11-55 |
5) 15.36 – 15.10 + 26.85 | 13) |
6) 75 – ( 3.52 – 4.23) | 14) |
7) 4.52 – 3.23 + 33:32 | 15) |
8) 80 – (4 . 52 – 3 . 23) | 9) 80 – 73.3 10) -8 – 51.2 |
17+82 :x+23=80
- Tính :
a) 160 - ( 2^3 . 5^2 - 6 . 25 )
b) 4 . 5^2 - 32 . 2^4
c) 5871 : [ 928 - ( 247 - 82 ) . 5 ]
d) 777 : 7 + 1331 : 11^3
e) 17 . 85 + 15 . 17 - 120
f) 15 . 141 + 59 . 15
g) 20 - [ 30 - ( 5 - 1 ) ^2 ]
h) 37 - 11 . 3 . ( 24 - 23 ) + 22 . 10
a. \(\left(\dfrac{23}{41}-\dfrac{15}{82}\right).\dfrac{41}{25}\)
tính hợp lí :(8/23+3/19-15/17)-(2/17-15/23)
tính hợp lí :(8/23+3/19-15/17)-(2/17-15/23)
A=15/19 . 17/23 + 15/19 . 19/23 - 15/19 . 13/23 = ?
\(A = \) -2 /17 + 15/23 + -15/17 + 4/19 + 8/23
