Tình nhanh 6 x 24 x 342 + 316 x 3012
Tính nhanh : 45 316 x 27 - 24 105 / 45 316 x 26 + 21 211
Tìm x :
a) 1206 : X + 342 : X = 6
b) 24 x X - 15 x X = 1980
hộ mình nha các bạn iu các bạn nhìu
Tình nhanh
19/13+14/6+1/9+4/6+7/13+17/9
315/316×313/314×316/315×317/314
Cần gấp, ai đúng em tick
\(\frac{19}{13}+\frac{14}{6}+\frac{1}{9}+\frac{4}{6}+\frac{7}{13}+\frac{17}{9}\)
\(=\left(\frac{19}{13}+\frac{7}{13}\right)+\left(\frac{14}{6}+\frac{4}{6}\right)+\left(\frac{1}{9}+\frac{17}{9}\right)\)
\(=\frac{26}{13}+\frac{18}{6}+\frac{18}{9}\)
\(=2+3+2\)
\(=7\)
\(\frac{315}{316}\times\frac{313}{314}\times\frac{316}{315}\times\frac{317}{314}\)
\(=\left(\frac{315}{316}\times\frac{316}{315}\right)\times\left(\frac{313}{314}\times\frac{317}{314}\right)\)
\(=1\times1,006339\)
\(=1,006339\)
#Chúc bạn học tốt !
#k mình nhé ?
3/7 + 4/5 + 4/7
3/2 x 4/5 x 2/3
4/6 + 7/13 + 17/9 + 19/13 + 1/9 + 14/6
315/316 x 316 /314 x 316/315 x 317/313
\(\frac{315}{316}\cdot\frac{316}{314}\cdot\frac{316}{315}\cdot\frac{317}{313}=\frac{315.316.316.317}{316.314.315.313}=\frac{1.1.316.317}{1.314.1.313}=\frac{100172}{98282}\)
Ta có : \(\frac{3}{2}\times\frac{4}{5}\times\frac{2}{3}\)
\(=\frac{3}{2}\times\frac{2}{3}\times\frac{4}{5}=1\times\frac{4}{5}\)
\(=\frac{4}{5}\)
Tính nhanh
a) (24 x 6 + 4 x 24) : ( 49 - 24 x 2)
b) 51 x 2 x 3 x 5
tìm x
c) X + 1234 + 3012 = 4724
+) 2748 + X - 8593 = 10495
x = 4724 - 3012 - 1234
x = 478
x = 10495 + 8593 - 2748
x = 16340
\(c,\Leftrightarrow x+4246=4724\)
\(\Leftrightarrow x=4724-4246\)
\(\Leftrightarrow x=478\)
\(+,\Leftrightarrow x-5845=10495\)
\(\Leftrightarrow x=10495+5845\)
\(\Leftrightarrow x=16340\)
c) X + 1234 + 3012 = 4724
x = 4724 - 3012 - 1234
x = 478
+) 2748 + X - 8593 = 10495
x = 10495 + 8593 - 2748
x = 16340
X + 1234 + 3012 = 4724
X + 1234 + 3012 = 4724
X + 4246 = 4724
X = 4724 - 4246
X = 478
1. Tính nhanh
A, 32684 + 41325 + 316 + 675
B, 25 x 18 x 4 x 2
C, 19 x 81 + 19 + 18 x 19
giúp với =)
a, 32684 + 41325 + 316 + 675
= (32684 + 316) + (41325 + 675)
= 33 000 + 42 000
= 75 000
b, 25 \(\times\) 18 \(\times\) 4 \(\times\) 2
= (25 \(\times\) 4) \(\times\) (18 \(\times\) 2)
= 100 \(\times\) 36
= 3600
c, 19 \(\times\) 81 + 19 + 18 \(\times\) 19
= 19 \({}\) \(\times\) 81 + 19 \(\times\) 1 + 18 \(\times\) 19
= 19 \(\times\) (81 + 1 + 18)
= 19 \(\times\) 100
= 1900
giá trị x thỏa mãn | x + 2 |+3x = 3012
<=>\(\orbr{\begin{cases}x+2+3x=3012\\-x+2+3x=3012\end{cases}}\)
<=>\(\orbr{\begin{cases}4x=3010\\2x=3010\end{cases}}\)
<=>\(\orbr{\begin{cases}x=752.5\\x=1505\end{cases}}\)
\(\left|x+2\right|+3x=3012\)
+)Nếu \(x< 2\)
<=>\(-\left(x+2\right)+3x=3012\)<=>\(-x-2+3x=3012\)
<=>\(2x-2=3012\)<=>\(2x=3014\)<=>\(x=1057\) (loại)
+)Nếu \(x\ge2\)
<=>\(x+2+3x=3012\)<=>\(4x+2=3012\)
<=>\(4x=3010\)<=>\(x=752,5\) (nhận)
Vậy x=752,5