6/20,9/12,12/32
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a) Theo thứ tự từ bé đến lớn là:
\(\frac{6}{11}\);\(\frac{6}{7}\);\(\frac{6}{5}\)
b) \(\frac{6}{20};\frac{9}{12};\frac{12}{32}\)TSC: 36
Ta có:
\(\frac{6}{20}=\frac{6x6}{20x6}=\frac{36}{120}\) \(\frac{9}{12}=\frac{9x4}{12x4}=\frac{36}{48}\) \(\frac{12}{32}=\frac{12x3}{32x3}=\frac{36}{96}\)
Vì \(\frac{36}{120}< \frac{36}{96}< \frac{36}{48}\)nên ta sắp xếp như sau: \(\frac{6}{20};\frac{12}{32};\frac{9}{12}\)
a) \(75.20,9+5^2.20,9\)
\(=20,9\left(75+5^2\right)\)
\(=20,9\left(75+25\right)\)
\(=20,9.100\)
\(=2090\)
b) \(86.15+150.1,4\)
\(=15\left(86+10.1,4\right)\)
\(=15\left(86+14\right)=15.100=1500\)
c) \(93.32+14.16\)
\(=16\left(93.2+14\right)\)
\(=16\left(186+14\right)=16.200=3200\)
d) \(98,6.199-990.9,86\)
\(=9,86\left(10.199-990\right)=9,86\left(1990-990\right)\)
\(=9,86.1000=9860\)
e) \(-8.40+2.108+24\)
\(=-8.40+2.4.27+8.3\)
\(=-8\left(40-27-3\right)=-8.10=-80\)
1.
c. \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{49.50}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{49}-\frac{1}{50}\)
\(=1-\frac{1}{50}\)
\(=\frac{49}{50}\)
2.
a. \(45-5\left(y+1\right)=10\)
\(\Rightarrow5\left(y+1\right)=35\)
\(\Rightarrow y+1=7\)
\(\Rightarrow y=6\)
b. \(y:2+y:2=15\)
\(\Rightarrow\frac{1}{2}y+\frac{1}{2}y=15\)
\(\Rightarrow y=15\)
Bài 1 :
\(a,12,5\times32\times8\)
\(=\left(12,5\times8\right)\times32\)
\(=100\times32\)
\(=3200\)
\(b,20,9+20,9\times99\)
\(=20,9\times\left(1+99\right)\)
\(=20,9\times100\)
\(=2090\)
\(c,\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+....+\frac{1}{49.50}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+....+\frac{1}{49}-\frac{1}{50}\)
\(=1-\frac{1}{50}\)
\(=\frac{50}{50}-\frac{1}{50}\)
\(=\frac{49}{50}\)
Bài 2 :
\(a,45-5\times\left(y+1\right)=10\)
\(5\times\left(y+1\right)=45-10\)
\(5\times\left(y+1\right)=35\)
\(y+1=35\div5\)
\(y+1=7\)
\(y=7-1\)
\(y=6\)
\(b,y\div2+y\div2=15\)
\(y\times\frac{1}{2}+y\times\frac{1}{2}=15\)
\(2\times\left(y\times\frac{1}{2}\right)=15\)
\(y=15\)
Học tốt
\(12,12\times99\times12,12\)
\(=\left(12,12\times12,12\right)\times99\)
\(=146,8944\times99\)
\(=14542,5456\)
12,12 x 7,5 + 12,12 : 2 + 12,12 + 12,12
= 12,12 x 7,5 + 12,12 x 0,5 + 12,12 x 1 + 12,12 x 1
= 12,12 x (7,5 + 0,5 + 1 + 1)
= 12,12 x 10
= 121,2
Tích phép tính trên là :
35,35 x 12,12 = 428,442
Đúng nha Huyết Tộc Cấm Vực
33,5x(102-2)=33,5x100=3350
33,5x(102-2)=33,5x100=3350
12,22x(99,7+0,3)=12,22x100=1222
4,2x(18,32-8,32)=4,2x10=42
33,5x(102-2)=33,5x100=3350
33,5x(102-2)=33,5x100=3350
12,22x(99,7+0,3)=12,22x100=1222
4,2x(18,32-8,32)=4,2x10=42