Cho a+b = 13 , tính giá trị của biểu thức sau : 102 x a+ 98 x b +52 x a +57 x b +a
Những câu hỏi liên quan
cho a + b = 13 hay tinh gia tri cua bieu thuc 102 x a + 98 x b + 52 x a + 57 x b + a
102xa+98xb+52xa+57xb+a
\(=a\times\left(102+52+1\right)+b\times\left(98+57\right)\)
=155xa+155xb
=155\(\times\)(a+b)
=155x13
=2015
Đúng 1
Bình luận (0)
a) Tìm x: x +
3
7
2
5
+
3
10
b) Tính giá trị biểu thức:
1
4
+
5
2
×
1
3
.
.
.
.
.
.
Đọc tiếp
a) Tìm x: x + 3 7 = 2 5 + 3 10
b) Tính giá trị biểu thức: 1 4 + 5 2 × 1 3 = . . . . . .
Tính giá trị biểu thức sau
A = 98 x a + 118 x b + 2 x a - 18 x b với a + b = 20.12
Ta có: A = 98 x a + 2 x a + 118 x b - 18 x b
= (98+2) x a + (118-18) x b
= 100 x a + 100 x b
= 100 x (a+b)
= 100 x 240
= 24000
Đúng 0
Bình luận (0)
Tính giá trị biểu thức sau:
A = 98 x a + 118 x b + 2 x a - 18 x b với a + b = 20.12
A=98 x a+118 x b+2 x a-18 x b
=(98+2) x a+(118-18) x b
=100 x a+100 x b
=100 x (a+b)
=100 x 20 x 12
=2000 x 12
=24000
Đúng 0
Bình luận (0)
cho biểu thức b=102 x a với giá trị nào của A trong các giá trị sau thì biểu thức a chia hết cho 9
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999+999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999+999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
Nguyễn Tất Phúc ko đăng linh tinh
Tl cho đàng hoàng
Còn ko biết TL thì ko nên TL
HT
Tìm k để mỗi biểu thức sau có giá trị lớn nhất, tìm giá trị lớn nhất đó: a) 3058 - k x 6
b) 585 : k + 2563
+ 9. Tính giá trị của biểu thức
(2+4+6+....+98 +100) x (a-bx6) với a=1800, b = 300
Tính giá trị của các biểu thức sau bằng cách thích hợp
a, 17,58 x 43 + 57 x 17,58
b, 43,57 x 2,6 x (630 – 315 x 2)
a, 17,58 x 43 + 57 x 17,58
= 17,58 x 43 + 17,58 x 57 (tính giao hoán)
= 17,58 x (43 + 57) = 17,58 x 100 = 1758 (nhân 1 số với 1 tổng)
b, 43,57 x 2,6 x (630 – 315 x 2)
= 43,57 x 2,6 x (630 – 630)
= 43,57 x 2,6 x 0 = 0
Đúng 0
Bình luận (0)
bài1 : cho biểu thức a = ( 7/13 + 6/13 ) x 100 -13 x a
a. tính giá trị biểu thức a khi a = 10
b. tìm giá trị a để biểu thức a có giá trị = 987
giúp mình vs bài này khó quá
Bài 1: A = (\(\dfrac{7}{13}\) + \(\dfrac{6}{13}\)) x 100 - 13 x a
Thay a = 10 vào A ta có:
A = (\(\dfrac{7}{13}\) + \(\dfrac{6}{13}\)) x 100 - 13 x 10
A = \(\dfrac{13}{13}\) x 100 - 130
A = 100 - 130
A = - 30
Thay a = 987 vào biểu thức A ta có:
A = (\(\dfrac{7}{13}\) + \(\dfrac{6}{13}\)) x 100 - 13 x 987
A = \(\dfrac{13}{13}\) x 100 - 12831
A = 100 - 12831
A = -12731
Đúng 0
Bình luận (0)
Tìm các giá trị của x sao cho hai biểu thức A và B cho sau đây có giá trị bằng nhau: A = x + 1 3 – x - 2 3 ; B = (3x – 1)(3x + 1)
T a c ó : A = B ⇔ ( x + 1 ) 3 – ( x – 2 ) 3 = ( 3 x – 1 ) ( 3 x + 1 ) ⇔ x 3 + 3 x 2 + 3 x + 1 – x 3 + 6 x 2 – 12 x + 8 = 9 x 2 – 1 ⇔ x 3 – x 3 + 3 x 2 + 6 x 2 – 9 x 2 + 3 x – 12 x = - 1 – 1 – 8 ⇔ - 9 x = - 10 ⇔ x = 10 / 9 V ậ y v ớ i x = 10 / 9 t h ì A = B .
Đúng 0
Bình luận (0)