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( 48 x 0,75 - 240 : 10 ) - ( 16 x 0,5 - 16 : 4 )
= ( 36 - 24 ) - ( 8 - 4 )
= 12 - 4
= 8
#Donaa-Học tốt nha:3
=(2*24*0,75-24)-(4*4*0,5-4)=(1,5*24-24)-(2*4-4)=((1,5-1)*24)-((2-1)*4)=(0,5*24)-4=12-4=8
\(\left(48.0,75-240:10\right)-\left(16.0,5-36:9\right)\)
\(=\left(48.\dfrac{3}{4}-24\right)-\left(16.\dfrac{1}{2}-4\right)=\left(36-24\right)-\left(8-4\right)=12-4=8\)
[Giải:]
107 + ( 210 + x ) = 317
210 + x = 317 - 107
210 + x = 210
x = 210 - 210
x = 0
2x + (0,5 + 25%) = 0,75
2x + (0,5 + 0,25) = 0,75
2x + 0,75 = 0,75
2x = 0,75 - 0,75
2x = 0
x = 0 : 2
x = 0
4221 : (x - 16 ) = 21
x - 16 = 4221 : 21
x - 16 = 201
x = 201 + 16
x = 217
50% + 0,75x = 0,5
0,5 + 0,75x = 0,5
0,75x = 0,5 - 0,5
0,75x = 0
x = 0 : 0,75
x = 0
| - Câu khác làm tương tự - |
[ Hoq chắc ]
a, 107 + ( 210 - x ) = 317
210 - x = 317 - 107
210 - x = 210
x = 210 - 210
x = 0
Vậy x = 0
b, 2x + ( 0,5 + 25% ) = 0,75
2x + 0,75 = 0,75
2x = 0,75 - 0,75
2x = 0
x = 0
Vậy x = 0
c, 4221 : ( x - 16 ) = 21
x - 16 = 4221 : 21
x - 16 = 201
x = 201 + 16
x = 217
Vậy x = 217
d, 156 - ( x + 61 ) = 21
x + 61 = 156 - 21
x + 61 = 135
x = 135 - 61
x = 74
Vậy x = 74
e, ( 235 - x ) - 81 = 54
235 - x = 54 + 81
235 - x = 135
x = 235 - 135
x = 100
Vậy x = 100
f, 50% + 0,75. x = 0,5
0,75. x = 0,5 - 50%
0,75. x = 0
x = 0
Vậy x = 0
Bài 1
2/5 - 3/5 : (0,75 + 30%)
= 2/5 - 3/5 : 21/20
= 2/5 - 4/7
= -6/35
‐--------------------
Bài 2
a) x/6 = -11/3
x = -11/3 . 6
x = -22
b) 16/5 của x là 48
x = 48 : 16/5
x = 15
( 2x + 1 / 2 ) * ( 3 / 4 - x ) = 0
=> 2x + 1 / 2 = 0 hoặc 3 / 4 - x = 0
2x = - 1 / 2 x = 3 / 4
x = - 1 / 4
Vậy x = -1 / 4 hoặc x = 3 / 4
2 / 10 * 12 + 2 / 12 * 14 + 2 / 14 * 16 + ... + 2 / 48 * 50
= 1 / 10 - 1 / 12 + 1 / 12 - 1 / 14 + 1 / 14 + 1 / 16 + .... + 1 / 48 - 1/ 50
= 1 / 10 - 1 / 50
= 2 / 25
Tìm x : \(\left(2x+\frac{1}{2}\right)\left(\frac{3}{4}-x\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2x+\frac{1}{2}=0\\\frac{3}{4}-x=0\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{-1}{2}\\x=\frac{3}{4}\end{cases}}}\)
Tính nhanh : \(\frac{2}{10.12}+\frac{2}{12.14}+...+\frac{2}{48.50}\)
\(=2\left(\frac{1}{10.12}+\frac{1}{12.14}+...+\frac{1}{48.50}\right)\)
\(=2.\frac{1}{2}\left(\frac{1}{10}-\frac{1}{12}+\frac{1}{12}-\frac{1}{14}+...+\frac{1}{48}-\frac{1}{50}\right)\)
\(=\frac{1}{10}-\frac{1}{50}\)
\(=\frac{2}{25}\)
\(a,\left(48\cdot0,75-240:10\right)-\left(16\cdot0,5-16:4\right)\)
\(=\left(48\cdot0,75-240\cdot0,1\right)-\left(16:2-16:4\right)\)
\(=\left(36-24\right)-\left(8-4\right)\)
\(=12-4=8\)
\(b,\left(\frac{1}{2}+\frac{3}{5}-\frac{2}{15}\right):\frac{3}{5}\)
\(=\left(\frac{11}{10}-\frac{2}{15}\right):\frac{3}{5}\)
\(=\frac{29}{30}:\frac{3}{5}=\frac{145}{90}=\frac{29}{18}\)
\(c,\left(\frac{13}{84}\cdot\frac{2}{5}-\frac{1}{2}\cdot\frac{7}{180}\right):\frac{27}{18}+\frac{1}{2}\cdot\frac{1}{10}\)
\(=\left(\frac{26}{420}-\frac{7}{360}\right):\frac{3}{2}+\frac{1}{20}\)
\(=\left(\frac{13}{210}-\frac{7}{360}\right):\frac{3}{2}+\frac{1}{20}\)
\(=\frac{107}{2520}:\frac{3}{2}+\frac{1}{20}\)
\(=\frac{214}{7560}+\frac{1}{20}=\frac{214}{7560}+\frac{378}{7560}\)
\(=\frac{592}{7560}=\frac{74}{945}\)
Trả lời:
a, \(\left(48\times0,75-240\div10\right)-\left(16\times0,5-16\div4\right)\)
\(=\left(36-24\right)-\left(8-4\right)\)
\(=12-4\)
\(=8\)
b,\(\left(\frac{1}{2}+\frac{3}{5}-\frac{2}{15}\right)\div\frac{3}{5}\)
\(=\left(\frac{11}{10}-\frac{2}{15}\right)\times\frac{5}{3}\)
\(=\frac{29}{30}\times\frac{5}{3}\)
\(=\frac{29}{18}\)
c,\(\left(\frac{13}{84}\times\frac{2}{5}-\frac{1}{2}\times\frac{7}{180}\right)\div\frac{27}{18}+\frac{1}{2}\times\frac{1}{10}\)
\(=\left(\frac{13}{210}-\frac{7}{360}\right)\times\frac{18}{27}+\frac{1}{2}\times\frac{1}{10}\)
\(=\frac{107}{2520}\times\frac{18}{27}+\frac{1}{20}\)
\(=\frac{107}{3780}+\frac{1}{20}\)
\(=\frac{74}{945}\)