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\(1,25+1\frac{1}{2}+50\%+1\frac{3}{4}+0,45+2,55\)
\(=\frac{5}{4}+\frac{3}{2}+\frac{1}{2}+\frac{7}{4}+\frac{9}{20}+\frac{51}{20}\)
\(=8\)
xin t i ck
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= 5/4+ 3/2 + 1/2 + 7/4 + 9/20 + 51/20
= ( 5/4 + 7/4 ) + ( 3/2 + 1/2) + ( 9/20+ 51/20)
= 12/4 + 4/2 + 60/20
=3 + 2 + 3 = 8
\(\left(1+x\right)+\left(2+x\right)+\left(3+x\right)+\)\(\left(4+x\right)+\left(5+x\right)=10\times5\)
\(\left(1+2+3+4+5\right)+\left(x+x+x+x+x\right)=50\)
\(15+5x=50\)
\(5x=35\)
\(x=7\)
Vậy \(x=7\)
\(\left(1+x\right)+\left(2+x\right)+\left(3+x\right)+\left(4+x\right)+\left(5+x\right)=10\times5\)
\(\Rightarrow1+x+2+x+3+x+4+x+5+x=50\)
\(\Rightarrow\left(1+2+3+4+5\right)+\left(x+x+x+x+x\right)=50\)
\(\Rightarrow15+5x=50\)
\(\Rightarrow5x=50-15\)
\(\Rightarrow5x=35\)
\(\Rightarrow x=35:5\)
\(\Rightarrow x=7\).
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
\(\left(b\right)y\times1,02=3,57\times3,06\)
\(\Leftrightarrow y\times1,02=10,9242\)
\(\Leftrightarrow y=10,9242\div1,02\)
\(\Leftrightarrow y=10,71\)
\(\left(c\right)15\div y-0,85=0,35\)
\(\Leftrightarrow15\div y=0,35+0,85\)
\(\Leftrightarrow15\div y=1,2\)
\(\Leftrightarrow y=15\div1,2\)
\(\Leftrightarrow y=12,5\)
\(\left(d\right)471,5-22,5\times y=12,5\)
\(\Leftrightarrow22,5\times y=471,5-12,5\)
\(\Leftrightarrow22,5\times y=459\)
\(\Leftrightarrow y=459\div22,5\)
\(\Leftrightarrow y=20,4\)
Kukad'z Lee'z
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
1. tìm a:
a : 2 - 8,6 = 2,43
a : 2 = 2,43 + 8,6
a : 2 = 11,03
a = 11,03 x 2
a = 22,06
2. tính giá trị biểu thức
8,16 : (1,24 + 3,56) - 0,249 14,7 + 0,35 x 3,78 - 10,8 (4,5 + 9,48) x \(\frac{1}{3}\) - 2,004
= 8,16 : 4,8 - 0,249 = 14,7 + 1,323 - 10,8 ko biết
= 1,7 - 0,249 = 16,023 - 10,8
= 1,451 = 5,223
Bài 1: Tìm a:
a : 2 - 8,6 = 2,43
a : 2 = 2,43 + 8,6
a : 2 = 11,03
a = 11,03 x 2
a = 22,06
Bài 2: Tính giá trị biểu thức:
8,16 : (1,24 + 3,56) - 0,249 ; 14,7 + 0,35 x 3,78 - 10,8 ; \(\left(4,5+9,48\right)\times\frac{1}{3}-2,004\)
= 8,16 : 4,8 - 0,249 ; = 14,7 + 1,323 - 10,8 ; \(=13,98\times\frac{1}{3}-2,004\)
= 1,7 - 0,249 ; = 16,023 - 10,8 ; \(=4,66-2,004\)
= 1,451 ; = 5,223 ;\(=2,656\)
Chúc bạn học tốt !!!
\(x(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{132}=\) \(5\frac{1}{2}\)
\(x\left(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+...+\frac{1}{11\cdot12}\right)=\frac{11}{2}\)
\(x\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{11}-\frac{1}{12}\right)=\frac{11}{2}\)
\(x\left(1-\frac{1}{12}\right)=\frac{11}{2}\)
\(x\cdot\frac{11}{12}=\frac{11}{2}\)
\(x=\frac{11}{2}:\frac{11}{12}\)
\(x=6\)
Vậy x = 6
\(\frac{x}{2}+\frac{x}{6}+\frac{x}{12}+\frac{x}{20}+...+\frac{x}{132}=5\frac{1}{2}\)
\(\Rightarrow x\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{132}\right)=\frac{11}{2}\)
\(\Rightarrow x\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{11.12}\right)=\frac{11}{2}\)
\(\Rightarrow x\left(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{11}-\frac{1}{12}=\frac{11}{2}\right)\)
\(\Rightarrow x\left(1-\frac{1}{12}\right)=\frac{11}{2}\)
\(\Rightarrow x.\frac{11}{12}=\frac{11}{12}\)
\(\Rightarrow x=\frac{11}{12}:\frac{11}{12}=1\)
Vậy x = 1
a) \(\frac{1}{3}-\frac{2}{x}=\frac{1}{6}\)
=> \(\frac{2}{x}=\frac{1}{3}-\frac{1}{6}\)
=> \(\frac{2}{x}=\frac{1}{6}\)
\(\Rightarrow x=12\)
Vậy x = 12
b) \(\frac{x-1}{2}=\frac{3}{4}\)
\(\Rightarrow\left(x-1\right).4=2.3\)
=> 4x - 4 = 6
=> 4.(x-1) = 6
=> x-1 = 6:4 = 1,5
=> x = 1,5 + 1
=> x = 2,5
Vậy x = 2,5
x – 0,35 = 2,55
x = 2,55 + 0,35
x = 2,9