100-[116-(13-5)2]
a) A= 100 - 116 : 4
b) B= 100 - [ 116 - (13 - 5)2]
c) C= |- 65| + (- 42) + |65|
a) A= 100 - 116 : 4
=100-29
=71
b) B= 100 - [ 116 - (13 - 5)2]
=100-[116-82]
=100-(116-64)
=100-52
=48
c) C= |- 65| + (- 42) + |65|
= 65+(-42)+65
= 88
a) A = 100 - 116 : 4
A = 100 - 29
A = 71
Vậy A = 71
b) B = 100 - [ 116 - ( 13 - 5 )2 ]
B = 100 - [ 116 - 82 ]
B = 100 - [ 116 - 64 ]
B = 100 - 52
B = 48
Vậy B = 48
c) C = | - 65 | + ( - 42 ) + | 65 |
C = 65 + ( - 42 ) + 65
C = ( 65 + 65 ) + ( - 42 )
C = 130 + ( - 42 )
C = 130 - 42
C = 88
100-[116-(13-52)]
\(100-\left(116-\left(13-5^2\right)\right)=100-\left(116-\left(-12\right)\right)\)
\(=100-\left(116+12\right)=100-128=-28\)
100-[116-(13-52)]
=100-[116-(13-25)]
=100-(116-13+25)
=100-(103+25)
=100-128
=-28
13.16+13.(-116)+17.(-100
\(13\cdot16+13\cdot\left(-116\right)+17\cdot\left(-100\right)\)
\(=13\left(16+-116\right)+17\cdot\left(-100\right)\)
\(=13\cdot\left(-100\right)+17\cdot\left(-100\right)\)
\(=\left(-100\right)\cdot\left(13+17\right)=30\cdot\left(-100\right)=-3000\)
13.16+13.(-116)+17.(-100)
=13.(-116+16)+17.(-100)
=13.(-100)+17.(-100)
=(-100).(13+17)
=-100.30
=(-3000)
Thực hiện phép tính :
a) 13 . 3^3 + 17 . 3^3
b) 76 - [ 26 + ( 16 - 2 . 7 ) ^3 ]
c) 3^2 . 7 - ( 1^10 + 24 ) : 5^2
d) 6 . 3^2 - 16 : 2^2
e) 4^2 . 17 - 4^2 . 11
h) 100 - [ 116 - ( 13 - 5 ) ^2 ]
g) 5^3 + ( 3^4 + 4 ) : 2 + ( 27 - 3 ) : 4
--- Giải nhanh hộ '-' Cảm ơn. ---
tính
a,100-[116-(13-52)]
\(100-\)\(\left[116-\left(13-5^2\right)\right]\)
=\(100-\left[116-\left(13-25\right)\right]\)
=\(100-\left[116-\left(-12\right)\right]\)
=\(100-\left(116+12\right)\)
=\(100-128\)
=\(-28\)
= 100 - [116 - (-12)]
=100-128
= (-28)
so sánh các phân số bằng cách nhanh nhất : a. 16/51 và 31/90; b. 2/3 và 13/17; b. 5/7 và 111/116
611 - [ 2 . ( x2 - 13 ) + 116 ] = 449
Tìm x
\(611-\left[2.\left(x^2-13\right)+116\right]=449.\)
\(\Rightarrow2.\left(x^2-13\right)+116=611-449\)
\(\Rightarrow2.\left(x^2-13\right)+116=162\)
\(\Rightarrow2.\left(x^2-13\right)=162-116\)
\(\Rightarrow2.\left(x^2-13\right)=46\)
\(\Rightarrow x^2-13=46:2\)
\(\Rightarrow x^2-13=23\)
\(\Rightarrow x^2=23+13\)
\(\Rightarrow x^2=36\)
\(\Rightarrow x=\orbr{\begin{cases}6\\-6\end{cases}}\)
611 - [ 2 * ( x2 - 13 ) + 116 ] = 449
2(x2 - 13 ) +116 = 162
2 * ( x2 - 13 ) = 162 - 116
2 * ( x2 - 13 ) = 46
x2 - 13 = 23
x2 = 36
x = 6
Vậy x = 6
Câu 1: tìm x:
(2x-15)3=(2x-15)5
Câu 2:so sánh:
11513+11512 với 11613
Câu 1
=> ( 2x-15)^3 - (2x -15)^5=0
(2x-15)^3 * ( -(2x-15)^2+1) =0
xét 2 TH : + (2x-15)^3=0
+ 1-(2x-15)^2 =0
=> ĐPCM
Tính { 2 + 4 + 6 + 8 +......... 100 ) * ( 58 * 8 - 116 * 4 ) =
Ta co so so hang cua tong 2+4+6+8+...100 la
(100-2):2+1=50(so hang)
Tong 2+4+6+8+...100 la
(100+2)x50:2=2550
Vi Gia tri cua bieu thuc 58x8-116x4=0
nen tich 2550x0=0
Ta co so so hang cua tong 2+4+6+8+...100 la
(100-2):2+1=50(so hang)
Tong 2+4+6+8+...100 la
(100+2)x50:2=2550
Vi Gia tri cua bieu thuc 58x8-116x4=0
nen tich 2550x0=0
(2+4+6+8+...+100)*(58*8-116*4)
=(2+4+6+8+...+100)*(58*2*4-116*4)
=(2+4+6+8+...+100)*(116*4-116*4)
=(2+4+6+8+...+100)*0
=0