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Viết cái đề cho rõ ràng dùm cái, mk đọc ko có hỉu j hết
a) 53.39 + 47.39 - 53.21 - 47.21
= 53.(39 - 21) + 47.(39 - 21)
= 53.18 + 47.18
= 18.(53 + 47)
= 18.100
= 1800
b) = ( 2 x 12 ) x 53 + ( 4 x 6 ) x 87 - ( 3 x 8 ) x 40
= 24 x 53 + 24 x 87 - 24 x 40
= 24 x ( 53 + 87 - 40 )
= 24 x 100
= 2400
Chúc bạn học tốt :3
Câu 1: \(\frac{5}{7}\):x+\(\frac{2}{3}\)=1\(\frac{1}{3}\)
\(\frac{5}{7}\):x+\(\frac{2}{3}\)=\(\frac{4}{3}\)
\(\frac{5}{7}\):x=\(\frac{4}{3}\) - \(\frac{2}{3}\)
\(\frac{5}{7}\):x=\(\frac{2}{3}\)
x=\(\frac{5}{7}\):\(\frac{2}{3}\)
x=\(\frac{15}{14}\)
Câu 2:x*\(\frac{3}{7}\)-\(\frac{5}{14}\)=2\(\frac{1}{3}\)
x*\(\frac{3}{7}\)-\(\frac{5}{14}\)=\(\frac{7}{3}\)
x*\(\frac{3}{7}\)=\(\frac{7}{3}\)+\(\frac{5}{14}\)
x*\(\frac{3}{7}\)=\(\frac{113}{42}\)
x=\(\frac{113}{42}\):\(\frac{3}{7}\)
x=\(\frac{791}{126}\)
Câu 3: 3\(\frac{5}{7}\)-x*\(\frac{1}{3}\)=1\(\frac{13}{11}\)
\(\frac{26}{7}\)-x*\(\frac{1}{3}\)=\(\frac{24}{11}\)
x*\(\frac{1}{3}\)=\(\frac{26}{7}\)-\(\frac{24}{11}\)
x*\(\frac{1}{3}\)=\(\frac{118}{77}\)
x=\(\frac{118}{77}\):\(\frac{1}{3}\)
x=\(\frac{356}{77}\)
`y:0,25+y:12,5+y:0,5-y:0,1=40`
`yxx4+yxx8+yxx2+yxx10=40`
`yxx(4+8+2-10)=40`
`yxx4=40`
`y=40:4`
`y=10`
Vậy `y=10`
`@An`
y : 0,25 + y : 12,5% + y : 0,5 - y : 0,1 = 40
y : 0,25 + y : 0,125 + y : 0,5 - y : 0,1 = 40
y x 4 + y x 8 + y x 2 - y x 10 = 40
y x (4 + 8 + 2 - 10) = 40
y x 4 = 40
y = 40 : 4
y = 10
a,2/3 * 3/4 * 4/5 * 5/6
Giản ước 3 với 3 , 4 với 4 , 5 với 5
=>2/3 * 3/4 * 4/5 * 5/6=2/6=1/3
b,5454/5757-171717/191919
=54/57-17/19
Quy đồng:54/57-(17*3/19*3)
=54/57-51/57
=3/57=1/19
NHỚ CLICK ĐÚNG CHO MÌNH NHA!!!!
a,2/3 * 3/4 * 4/5 * 5/6
Giản ước 3 với 3 , 4 với 4 , 5 với 5
=>2/3 * 3/4 * 4/5 * 5/6=2/6=1/3
b,5454/5757-171717/191919
=54/57-17/19
Quy đồng:54/57-(17*3/19*3)
=54/57-51/57
=3/57=1/19
a) 12925 : x + 3247 = 3522
12925 : x = 3522 - 3247
12925 : x = 275
x = 12925 : 275
x = 47
b) 17658 : x - 178 = 149
17658 : x = 149 + 178
17658 : x = 327
x = 17658 : 327
x = 54
c) 15892 : x . 96 = 5568
15892 : x = 5568 : 96
15892 : x = 58
x = 15892 : 58
x = 274
Chúc bạn học tốt nhé :)
a) 12925 : x + 3247 = 3522
12925 : x = 3522 - 3247
12925 : x = 275
x = 12925 : 275
x = 47
b) 17658 : x - 178 = 149
17658 : x = 149 + 178
17658 : x = 327
x = 17658 : 327
x = 55,092
c) 15890 : x * 96 = 5568
15890 : x = 5568 : 96
15890 : x = 58
x = 15890 : 58
x = 273,45
K NHA MK XONG NHẤT ĐÓ
CHÚC BẠN HỌC TỐT
\(a,x-\frac{5}{6}:1\frac{1}{6}=0,125\)
\(x-\frac{5}{6}:\frac{7}{6}=\frac{1}{8}\)
\(x-\frac{5}{7}=\frac{1}{8}\)
\(x=\frac{1}{8}+\frac{5}{7}\) \(x=\frac{47}{56}\)
\(b,\left(1-\frac{2}{10}+x+\frac{1}{5}\right):\left(1\frac{1}{3}-\frac{2}{3}+3\frac{1}{3}\right)-1=1\frac{1}{2}\)
\(\left(1-\frac{1}{5}+x+\frac{1}{5}\right):\left(\frac{4}{3}-\frac{2}{3}+\frac{10}{3}\right)-1=\frac{3}{2}\)
\(\left(\frac{4}{5}+x+\frac{1}{5}\right):4=\frac{3}{2}+1\)
\(\left(1+x\right):4=\frac{5}{2}\)
\(1+x=\frac{5}{2}.4\)
\(1+x=10\)
\(x=10-1\)
\(x=9\)
\(\frac{3}{10}+\frac{3}{40}+\frac{3}{88}+...+\frac{3}{460}\)
\(=\frac{3}{2\cdot5}+\frac{3}{5\cdot8}+\frac{3}{8\cdot11}+...+\frac{3}{20\cdot23}\)
\(=\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{11}+...+\frac{1}{20}-\frac{1}{23}\)
\(=\frac{1}{2}-\frac{1}{23}\)
\(=\frac{21}{46}\)
3/5 * x + x * 2 + 40 = 53
x * (3/5 + 2) = 53 - 40
x * 13/5 = 13
x = 13 : 13/5 = 5
`3/5xx x+x xx2+40=53`
`x xx(3/5+2)=53-40`
`x xx(3/5+10/5)=13`
`x xx13/5=13`
`x =13:13/5`
`x=13xx5/13=5`