86-84+82-80+...+8-6+4-2
77-75+73-71+...+7-5+3-1
Tính nhanh
c) 82 .(−71)+(−29) .82+1^2021
Thực hiện phép tính: (Tính nhanh nếu có thế)
1) 347.2\(^2\)-2\(^2\).(216+184):8
2) 132-[116-(132-128)\(^2\)]
3) 16:{400:[200-(37+46.3)]}
4) {184:[96-124:31]-2}.3651
5) ) 46 – [ (16 + 71 . 4 ) : 15 ]} – 2
6) 33.18 + 72 .42 – 41 .18
7)( 56 . 46 – 25 . 23 ) : 23
8) ( 28 . 54 + 56 . 36 ) : 21 : 2
9) ( 76 . 34 – 19 . 64 ) : ( 38 . 9 )
10) ( 2+ 4 + 6 + ….. + 100 ) . ( 36 . 333 – 108 . 111)
11) ( 5 . 411- 3 .165 ): 410
12) \(\dfrac{7256.4375-725}{3650+4375.7255}\)
Rút gọn phân số: \(D=\frac{10^8.48^6.18^8-50^2.36^8.12^6}{240^5.72^8.9^3-20^5.96^6.27^7}\)
Thực hiện phép tính: (Tính nhanh nếu có thế)
1) 347.222-222.(216+184):8
2) 132-[116-(132-128)22]
3) 16:{400:[200-(37+46.3)]}
4) {184:[96-124:31]-2}.3651
5) ) 46 – [ (16 + 71 . 4 ) : 15 ]} – 2
6) 33.18 + 72 .42 – 41 .18
7)( 56 . 46 – 25 . 23 ) : 23
8) ( 28 . 54 + 56 . 36 ) : 21 : 2
9) ( 76 . 34 – 19 . 64 ) : ( 38 . 9 )
10) ( 2+ 4 + 6 + ….. + 100 ) . ( 36 . 333 – 108 . 111)
11) ( 5 . 411- 3 .165 ): 410
12) 7256.4375−725/3650+4375.7255
a)(2^4.7^3+7^4.36) : (7^3.20-7^3.16)
b)(8^4.13+4^6.27):(2^13.15-2^12.6
tính A biết: A=2/3+15/16+18/19+20/21+60/61+71/72+82/83+93/94
311-x+82=46+x-21
-(x-3+84)=-x+70-71-5
Tìm x
311-x+82=46+x-21
-(x-3+84)=-x+70-71-5