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\(7-\left(11+x-13\right)\div2\frac{2}{3}=2\)
\(\left(11+x-13\right)\div2\frac{2}{3}=7-2\)
\(\left(11+x-13\right)\div2\frac{2}{3}=5\)
\(11+x-13=\frac{40}{3}\)
\(11+x=\frac{79}{3}\)
\(x=\frac{46}{3}\)
7 - ( 11 + x - 13) = 2 x 2/2/3 ( 2/2/3 là hỗn số)
7 - ( 11 + x - 13) = 16/3
( 11 + x - 13) = 7 - 16/3
11 + x - 13 = 5/3
11 + x = 5/3 + 13
11 + x = 44/3
x = 44/3 - 11
x = 11/3
\(78-\left(x-25\right).3\frac{1}{3}=73\)
\(78-\left(x-25\right)\cdot\frac{10}{3}=73\)
\(\left(x-25\right)\cdot\frac{10}{3}=78-73\)
\(\left(x-25\right)\cdot\frac{10}{3}=5\)
\(x-25=5:\frac{10}{3}\)
\(x-25=1,5\)
\(x=25+1,5=26,5\)
Tìm x :
2,8 : x - 1,5 = 2,3 : 5,75
=> x - 1,5 = 5,75
x = 5,75 + 1,5
x = 7,25
Tính nhanh :
\(\frac{1}{1\times2}+\frac{1}{2\times3}+\frac{1}{3\times4}+...+\frac{1}{13\times14}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{13}-\frac{1}{14}\)
\(=1-\frac{1}{14}+0+...+0\)
\(=\frac{13}{14}\)
1. 2,8 : x - 1,5 = 2,3 : 5,75
2,8 : x - 1,5 = 0,4
2,8 : x = 0,4 + 1,5
2,8 : x = 1,9
x = 2,8 : 1,9
x = 1,473
2. \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{13.14}\)
= \(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{13}-\frac{1}{14}\)
= \(1-\frac{1}{14}\)
= \(\frac{13}{14}\)
35 x 12 + 65 x 13 = 35 x 12 + 65 x 12 + 65 = 12 x ( 35 + 65 ) + 65 = 12 x 100 + 65 = 1200 + 65 = 1265
7 - ( 11 + x -13 ) : \(2\frac{2}{3}\) = 2
(11+ x - 13) : \(2\frac{2}{3}\) = 7-2
(11 + x - 13) : \(2\frac{2}{3}\)= 5
11 + x - 13 = 5 . \(2\frac{2}{3}\)
11 + x - 13 = \(\frac{40}{3}\)
11 + x = \(\frac{40}{3}+13\)
11 + x = \(\frac{79}{3}\)
x = \(\frac{79}{3}-11\)
x = \(\frac{46}{3}\)
Tính nhanh :
136 x 68 + 16 x 272
Giúp mk nhé ! Mk cần gấp ! Ai giải đúng và đầy đủ thì mk tk cho 3 tk
136 x 68 + 16 x 272
= 136 x 68 + 16 x 2 x 136
= 136 x 68 + 32 x 136
= 136 x ( 68 + 32 )
= 136 x 100
= 13600
a) 35 x 34 + 35 x 38 + 65 x 75 + 65 x 45
= 35 x (34+38) + 65 x (75 + 45)
= 35 x 72 + 65 x 120
= 2520 + 7800 = 10320
b) 3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12
= 3 x ( 25 x 8) + 4 x (37 x 6) + 2 x (38 x 12)
= 3 x 200 + 4 x 222 + 2 x 456
= 600 + 888 + 912 = 2400
tk nha
35 x 34 + 35 x 38 + 65 x 75 + 65 x 45
= 35 x ( 34 + 38 ) + 65 x ( 45 + 75 )
= 35 x 72 + 65 x 120
(11+x-13):\(2\frac{2}{3}\)=7-2
(11+x-3):\(\frac{8}{3}\)=5
11+x-3 =5 * \(\frac{8}{3}\)
11+x-3=\(\frac{40}{3}\)
x-3=\(\frac{40}{3}\) -11=\(\frac{40}{3}\) -\(\frac{33}{3}\)
x-3=\(\frac{7}{3}\)
x=\(\frac{7}{3}\) +3=\(\frac{7}{3}\)+\(\frac{9}{3}\)
x=\(\frac{16}{3}\)=\(5\frac{1}{3}\)
7 - ( 11 + x - 13 ) = 2 x \(\frac{8}{3}\)
7 - ( 11 + x - 13 ) = \(\frac{16}{3}\)
11 + x - 13 = 7 - \(\frac{16}{3}\)
11 + x - 13 = \(1\frac{2}{3}\)
11 + x = \(1\frac{2}{3}\)+ 13
11 + x = \(14\frac{2}{3}\)
x = \(14\frac{2}{3}-11\)
x = \(3\frac{2}{3}\)
Vậy x = \(\frac{11}{3}nha\)!!!