Ta có: \(\frac{1}{32}< \frac{1}{30};\frac{1}{35}< \frac{1}{30}\)
=> \(\frac{1}{30}+\frac{1}{32}+\frac{1}{35}< \frac{1}{30}+\frac{1}{30}+\frac{1}{30}=\frac{1}{10}\)
\(\frac{1}{47}< \frac{1}{45};\frac{1}{50}< \frac{1}{45}\)
=> \(\frac{1}{45}+\frac{1}{47}+\frac{1}{50}< \frac{1}{45}+\frac{1}{45}+\frac{1}{45}=\frac{3}{45}=\frac{1}{15}\)
=> \(\frac{1}{3}+\frac{1}{30}+\frac{1}{32}+\frac{1}{35}+\frac{1}{45}+\frac{1}{50}< \frac{1}{3}+\frac{1}{10}+\frac{1}{15}=\frac{1}{2}\)
CMR:1/3+ 1/30+ 1/32+ 1/35+ 1/45+ 1/47+1/50 <1/2
Chứng minh rằng 1/3 + 1/30 + 1/32 + 1/35 +1/45 + 1/47+ 1/50 < 1/2
\(CMR:\frac{1}{3}+\frac{1}{30}+\frac{1}{32}+\frac{1}{45}+\frac{1}{47}+\frac{1}{50}< \frac{1}{2}\)
Chứng minh rằng\(\frac{1}{3}\)+ \(\frac{1}{30}\) + \(\frac{1}{32}\) + \(\frac{1}{35}\) + \(\frac{1}{45}\) + \(\frac{1}{47}\) + \(\frac{1}{50}\) < \(\frac{1}{2}\)
Bài 1: Tìm x
a) (2x+5)^2=196
b) (-3x+1)^2=25
c) ( x+1)^3=-27
d) (x^2-9) . (x^2+1)=0
Bài 2 : Tính nhanh
a) -25 .68+(-34).(-256)
b) -35(45-74)-74 . (35+45)
c) (-2)^5 . 30 +(-2)^5 . 69+(-32)
d) 25.(32+47)-32 . ( 25+47)
CẦN GẤP !!!!!!!! AI NHANH TICK CHO...
Bài 1: Tìm x , biết:
a) ( 2x+5)^2=196 b) (-3x+1)^2=25
c) (x+1)^3=(-27) d) (x^2 -9).(x^2+1)=0
Bài 2 : Tính nhanh:
a) -25.68+(-34).(-256)
b) -35 . (45-74)-74.(35+45)
c) (-2)^5 .30+(-2)^5.69+(-32)
d) 25.(32+47)-32.(25+47)
CẦN GẤP AI NHANH TICK CHO NHA!!!!!!!!!
cmr
1/3+1/31+1/35+1/37+1/47+1/53+1/61<1/2
1. Thực Hiện Phép Tính
a.1/-4-4/-3+1/-3(50%-1 2/3
b.-1,4x15/-49-(2/5+4/3): 2 3/5
c.75%-1 1/2 +0,5 /5/12
d.0,7x2 2/3x20x0,375x5/28
2.Tính Nhanh
a.A=12,87-14,7+14,13-37,3
b.B=-4/12+18/45+-6/9+-21/35+6/30
Cmr 7/12 < A< 5/6
Biết A=1-1/2+1/3-1/4+...+1/47-1/48+1/49-1/50
