78,4:((15,7-7,86)x4,12
tinh gia tri bieu thuc
voi A = 2 gia tri cua bieu thuc A la
A =
tim gia tri cua bieu thuc a de bieu thuc A co gia tri lon nhat tim gia tri lon nhat do
Cho bieu thuc: A= 2,25 ×( a-12,5)+4,35
a) Tim gia tri cua bieu thuc A khi a= 112,5
b) Tin gia tri cua a de bieu thuc A co gia tri be nhat, gia tri be nhat la bao nhieu?
A = 2,25 x ( 112,5 -12,5 ) + 4,35
= 2,25 x 100 + 4,35
= 225 + 4,35
= 229,35
CHO bieu thuc
B=17,58*43+57*17,58/293*A
a)tim gia tri cua bieu thuc Bkhi a=2
b)tinh gia tri a khi B=2
c)tim gia tri so tu nhien ad biet bieu thuc B co gia tri lon nhat ,gia tri lon do la bao nhieu
78,4:(15,7-7,86)×4,12
=
=
(131,4-80,8):2,3-21,84
=
=
6/7:(1/2×3/4)-5/8
=
=
8,16:(1,32+3,48)-0,345
78,4 : ( 15,7 - 7,86 ) . 4,12
= 78,4 : 7,84 . 4,12
= 10 . 4,12
= 41,2
( 131,4 - 80,8 ) : 2,3 - 21,84
= 50,6 : 2,3 - 21,84
= 22 - 21,84
= 0,16
[ P/S : Tính sai =>bỏ ]
78,4:(15,7-7,86)x4,12
=78,4:7,84x4,12
=10x4,12
=41,2
(131,4-80,8):2,3-21,84
=50,6:2,3-21,84
=22-21,84
=0,16
8,16:(1,32+3,48)-0,345
=8,16:4,8-0,345
=1,7-0,345
=1,355
6/7 : ( 1/2 . 3/4) - 5/8
= 6/7 : 3/8 - 5/8
= 16/7 - 5/8
=93/56
8,16 : ( 1,32 + 3,48) - 0,345
= 8,16 : 4,8 - 0,345
= 1,7 - 0,345
= 1,355
[ P/S : /Giống trên/
Tinh gia tri bieu thuc [m + n ]:p neu m=5,n=19 va p=3 .Vay gia tri bieu thuc la:
cho bieu thuc A=2,45*(a+64,36)-45
a tinh gia tri bieu thuc A khi a=35,64
b tim gia tri cua A de bieu thuc A =126,5
b. Neu A =126.5 thì 126.5=2.45 x (a+64.36) -45
= 2.45 x (a+64.36) 126.5 + 45
= 2.45 x (a+64.36) = 171.5
= a+64.36 = 171.5 : 24.5
a+64.36 = 70
a = 70 - 64.36
a = 5.64
a,thay a=35,64vào bthuc đã cho ta đc:
A= 2,45x(35,64 +64,36)-45=2,45x100-45=200
b,để A=126,5 thì 2,45x(a+64,36)-45=126,5
=>2,45a+157,682-45=126,5
=>2,45a=13,818
=>a=5,64
cistian ronaldo
gia tri cua bieu thuc ; m+4050⋮5 voi m=2945 la ............... gia tri cua bieu thuc;n-57*13 voin=9876 la...................
\(m+4050=2945+4050=6995\)
\(n-57\times13=9876-57\times13=9876-741=9135\)
Tim x sao cho gia tri bieu thuc 2-5x nho hon gia tri bieu thuc 3(2-x)
tim gia tri x nguyen de bieu thuc (3x2-4x+x-1)/(3x+2) co gia tri nguyen
tim gia tri x nguyen de bieu thuc (3x3-4x2+x+1)/(x-4) co gia tri nguyen