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a, 200 - 3( x - 16 ) = 20
3( x - 16 ) = 200 - 20 = 180
x - 16 = 180 : 3 = 60
x = 60 + 16 = 76
b, 5 + 10 + 15 + .............. + 95 + 100 + 105 = 1200
c, x + ( 99 - 97 + 95 - 93 + ............ + 7 - 5 + 3 - 1 ) = 100
x + ( 2 . 25 ) = 100
x + 50 = 100
x = 100 - 50 = 50
****, thks
\(a,x-35,77=89,123\\ \Rightarrow x=89,123+35,77\\ \Rightarrow x=124,893\)
\(b,x+41,17=12,3\times4\\ \Rightarrow x+41,17=49,2\\ \Rightarrow x=49,2-41,17\\ \Rightarrow x=8,03\)
\(c,67,8-x=27\\ \Rightarrow x=67,8-27\\ \Rightarrow x=40,8\)
\(d,x:3=7716+22,1\\ \Rightarrow x:3=7738,1\\ \Rightarrow x=7738,1\times3\\ \Rightarrow x=23214,3\)
\(e,x:5=0,127\times9\\ \Rightarrow x:5=1,143\\ \Rightarrow x=1,143\times5\\ \Rightarrow x=5,715\)
Tìm X:
3,5 x X + 1,54 x 3,5 =15
20 + 12 : ( X - 2019 ) =32
Tính nhanh:
3/7 x 4/13 +3/7 x 9/13 + 5 và 4/7
1)\(3,5\cdot x+1,54\cdot3,5=15\)
\(3,5\left(x+1,54\right)=15\)
\(x+1,54=\frac{15}{3,5}\)
\(x+1,54=\frac{30}{7}\)
\(x=\frac{30}{7}-1,54\)
\(x=\frac{30}{7}-\frac{77}{50}\)
\(x=\frac{961}{350}\)
\(20+\frac{12}{x-2019}=32\)
\(\frac{12}{x-2019}=32-20\)
\(\frac{12}{x-2019}=12\)
\(x-2019=\frac{12}{12}\)
\(x-2019=1\)
\(x=1+2019\)
2)
\(\frac{3}{7}\cdot\frac{4}{13}+\frac{3}{7}\cdot\frac{9}{13}+5\frac{4}{7}\)
\(=\frac{3}{7}\cdot\frac{4}{13}+\frac{3}{7}\cdot\frac{9}{13}+13\cdot\frac{3}{7}\)
\(=\frac{3}{7}\left(\frac{4}{13}+\frac{9}{13}+13\right)\)
\(=\frac{3}{7}\cdot14\)
\(=6\)
3.5*(x-1.54)=15
x+1.54=15;3.5
x+1.54=4.28
x=4.28-1.54
x=2.74
chưa suy nghĩ
Bài 1:
a; (\(\dfrac{1}{4}\)\(x\) - \(\dfrac{1}{8}\)) x \(\dfrac{3}{4}\) = \(\dfrac{1}{4}\)
\(\dfrac{1}{4}x\) - \(\dfrac{1}{8}\) = \(\dfrac{1}{4}\) : \(\dfrac{3}{4}\)
\(\dfrac{1}{4}\)\(x\) - \(\dfrac{1}{8}\) = \(\dfrac{1}{4}\) x \(\dfrac{4}{3}\)
\(\dfrac{1}{4}x\) - \(\dfrac{1}{8}\) = \(\dfrac{1}{3}\)
\(\dfrac{1}{4}x\) = \(\dfrac{1}{3}\) + \(\dfrac{1}{8}\)
\(\dfrac{1}{4}\) \(x\)= \(\dfrac{8}{24}\) + \(\dfrac{11}{24}\)
\(\dfrac{1}{4}x=\dfrac{11}{24}\)
\(x=\dfrac{11}{24}:\dfrac{1}{4}\)
\(x=\dfrac{11}{24}\times4\)
\(x=\dfrac{11}{6}\)
b; \(\dfrac{12}{5}:x\) = \(\dfrac{14}{3}\) x \(\dfrac{4}{7}\)
\(\dfrac{12}{5}\) : \(x\) = \(\dfrac{8}{3}\)
\(x\) = \(\dfrac{12}{5}\) : \(\dfrac{8}{3}\)
\(x\) = \(\dfrac{12}{5}\) x \(\dfrac{3}{8}\)
\(x\) = \(\dfrac{9}{10}\)
a: =1,75h*5+1,75h*3+1,75h*2
=1,75h*10
=17,5h
b: =>108,19:x=16,4
=>x=108,19/16,4=10819/1640
1) 2,75 - 5/6 × 2/5 = 2,75 - (5/6) × (2/5) = 2,75 - 1/3 = 2,75 - 0,33 = 2,42
2) 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 3/4) - 3/5 = 1,25 - (5/6 - 9/12) - 3/5 = 1,25 - (10/12 - 9/12) - 3/5 = 1,25 - 1/12 - 3/5 = 1,25 - 0,08 - 0,6 = 1,25 - 0,68 = 0,57
3) 4/9 × 0,75 + 8/5 + 3,125 = (4/9) × 0,75 + 8/5 + 3,125 = 0,44 + 8/5 + 3,125 = 0,44 + 1,6 + 3,125 = 0,44 + 4,725 = 5,165
4) 1,125 - 4/7 - 0,12 = 1,125 - (4/7) - 0,12 = 1,125 - 0,57 - 0,12 = 0,435 - 0,12 = 0,315
5) (1/3 + 0,4) × 3,5 + (1/6 + 0,75) × 6/5
Câu đầu:
12/5 - X x 3/4 =5/4
X x 3/4 =12/5 - 5/4 ra X x 3/4 = 23/20 , X = 23/20 : 3/4 ,X=23/15
Câu hai:
X : 3/5 + 3/8 =15/8
X : 3/5 =15/8 - 3/8 ra X : 3/5 = 15/8 , X= 15/8 x 3/5,X= 9/8
`@` `\text {Ans}`
`\downarrow`
`a,`
`(x-1954) \times 5=50`
`x-1954 = 50 \div 5`
`x-1954 = 10`
`x=10 + 1954`
`x= 1964`
`B.`
`48 - 40 \times x=8`
`40 \times x=48-8`
`40 \times x = 40`
` x=40 \div 40`
`x=1`
`C.`
`2+70 \div x = 3`
`70 \div x = 3-2`
`70 \div x = 1`
`x=70 \div 1`
`x=70`
`D. [3 \times (x+2) \div 7] \times 4=120`
`3 \times (x+2) \div 7 = 120 \div 4`
`3 \times (x+2) \div 7 =30`
`3 \times (x+2) = 30 \times 7`
`3 \times (x+2)=210`
`x+2=210 \div 3`
`x+2=70`
`x=70-2`
`x=68`
`E.`
`7,2 \div [ (0,6 \times x+8) \div 20 + 59] = 0,12?` Thiếu ngoặc bạn nhé._.
\(a,\left(x-1954\right)\times5=50\\ x-1954=50:5\\ x-1954=10\\ x=1954+10\\ x=1964\\b.48-40\times x=8\\40\times x=48-8\\40\times x=40\\ x=40:40\\ x=1 \\ c.2+70:X=3\\ 70:x=3-2\\ 70:x=1\\ x=70:1\\ x=70\\ d,\left[3\times\left(x+2\right):7\right]\times4=120\\ 3\times\left(x+2\right):7-120:4\\ 3\times\left(x+2\right):7=30\\ \left(x+2\right):7=30:3\\ \left(x+2\right):7=10\\ x+2=10\times7\\ x+2=70\\ x=70-2\\ x=68\)
A) X = 70,5 - ( 89,075 : 3,5 )
X = 70,5 - 25,45
X = 40,05
B) X = ( 67,8 : 1,5 ) + 20,5
X = 45,2 + 20,5
X = 65,7
thanks