tinh giai tri cac bieu thu sau mot cach hop ly
a , 125 . (-61 ) .(-2)3. ( - 1 )2.n (n thuoc N*)
tinh gia tri bieu thuc mot cach hop ly
a , 125. (- 61 ) . (-2 )3 . ( - 1 )2.n ( n thuoc N*)
125.(-61).(-8).1
=[125.(-8)].[-61.1]
=-1000.(-61)
=61000
Tinh gia tri cua cac bieu thuc sau bang cach hop li
a) 125 : (-61) . (-23) . (-1) 2n
b) 136 . (-47) + 36 . 47
Tinh hop li
(-48). 72 + 36 . (-304)
125 . (-61) . (-2)^3 . (-1)^2n (n thuoc N)
Giai theo cach quy tac chuyen ve
TINH GIA TRI BIEU THUC ko tim n tinh bieu thuc
125.(-61):(-2)^3:(-1)^2n (nTHUOC N*)
TINH GIA TRI BIEU THUC LABANG CACH HOP LY
A, 54 X 113 + 54 X 113 + 113
A, 54 X 113 + 54 X 113 + 113
= 54 X 113 + 54 X 113 + 113x1
= (54+54+1)x113
= 109 x113
= 12317
=113(54+54+1)=113x109=12317
cho bieu thuc:
A=(6-2/3+1/2)-(5+5/3-3/2)-(3-7/3+5/2)
hay tinh gia tri cua A theo hai cach
cach 1:truoc het tinh gia tri tung bieu thuc trong ngoac
cach 2:bo dau ngoac roi nhom cac so hang thich hop
C1: \(A=\left(\frac{36}{6}-\frac{4}{6}+\frac{3}{6}\right)-\left(\frac{150}{30}+\frac{50}{30}-\frac{45}{30}\right)-\left(\frac{18}{6}-\frac{14}{6}+\frac{15}{6}\right)\)
\(=\frac{35}{6}-\frac{155}{30}-\frac{19}{6}=\frac{35}{6}-\frac{31}{6}-\frac{19}{6}=-\frac{15}{6}=-2\frac{1}{2}\)
C2: \(6-\frac{2}{3}+\frac{1}{2}-5-\frac{5}{3}+\frac{3}{2}-3+\frac{7}{3}-\frac{5}{2}\)
\(=\left(6-5-3\right)-\left(\frac{2}{3}+\frac{5}{3}-\frac{7}{3}\right)+\left(\frac{1}{2}+\frac{3}{2}-\frac{5}{2}\right)\)
\(=-2-0-\frac{1}{2}=-2\frac{1}{2}\)
Thuc hien phep tinh 1 cach hop li
a, A = 120 - ( 61) × (-2)^3 × ( -1)^ 2n ( n thuoc N*)
b, B = 136 × (-47) +36 × 47 - (-1)^n (n le)
c, C = (-48) + 72 +36 + (-304)
a: A=120-61x(-8)
=120+488=608
b: =47(-136+36)-(-1)
=-4700+1=-4699
c: C=(-48-304+72)+36
=-352+72+36
=-280+36=-244
bai 1
cho bieu thuc A = 5/n+1 voi N THUOC Z
a, de A la phan so thi n co dieu kien gi ?
b , tim tat ca cac gia tri nguyen cua n de gia tri A la 1 so nguyen ?
bai 2
cho bieu thuc M = 6/n-3 voi n thuoc Z .Co bao nhieu gia tri cua n de :
a, M ko phai la phan so
b , M la phan so va cp gia tri nguyen ?
bai 3 viet tap hop cacs so nguyen sao cho :
-12/4 < x <6/3
Bài 1:
a: Để A là phân số thì n+1<>0
hay n<>-1
b: Để A là số nguyên thì \(n+1\in\left\{1;-1;5;-5\right\}\)
hay \(n\in\left\{0;-2;4;-6\right\}\)
Thuc hien phep tinh 1 cach hop li
a, 120 - ( 61) × (-2)^3 × ( -1)^ 2n ( n thuoc N*)
b, 136 × (-47) +36 × 47
c, (-48) + 72 +36 + (-304)
b) \(=-47\left(136-36\right)\)
=\(-47.100=-4700\)