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\(15\times\left(32-24\div x\right)-230=70\)
\(15\times\left(32-24\div x\right)=300\)
\(32-24\div x=20\)
\(24\div x=12\)
\(x=2\)
\(15\times\left(32-24:x\right)-230=70\)
\(15\times\left(32-24:x\right)=70+230\)
\(15\times\left(32-24:x\right)=300\)
\(32-24:x=300:15\)
\(32-24:x=20\)
\(24:x=32-20\)
\(24:x=12\)
\(x=24:12\)
\(x=2\)
\(#WendyDang\)
a) 2 * x - 138 = 8 * 9
2 * x - 138 = 72
2 * x = 210
x = 105
b) 231 - ( x - 6 ) = 1339 : 13
231 - x + 6 = 103
237 - x = 103
x = 134
c) 70 - 5 * ( x-3) = 45
5 * (x-3) = 25
x - 3 = 5
x = 8
cac phan con lai bn lm tuong tu nha
* 2*X-138=8*9
<=> 2*X-138=72
<=> 2*X=72+138
<=> 2*X=210
<=> X=210/2=105
*231-(X-6)=1339:13
<=> 231-(X-6)=103
<=> X-6=231-103
<=>X-6=128
<=>X=128+6=134
*70-5*(X-3)=45
<=>5*(X-3)=70-45
<=>5*(X-3)=25
<=>X-3=25/5
<=>X-3=5
<=>X=8
*10+2*X=16
<=>2*X=16-10
<=>2*X=6
<=>X=6/2=3
a)230+[(x-5)+16]=315.8
<=>230+[(x-5)+16]=2520
<=>(x-5)+16=2290
<=>x-5=2274
<=>x=2279
b)20-[(x-5)+4]=2
<=>(x-5)+4=18
<=>x-5=14
<=>x=19
c)[(6x-72):2-84].14=2814
<=>(6x-72):2-84=201
<=>(6x-72):2=285
<=>6x-72=570
<=>6x=642
<=>x=107
Những dạng này ko khó chút nào em động não tí là ra à :D
a)230+[(x-5)+16]=315.8
<=>230+[(x-5)+16]=2520
<=>(x-5)+16=2290
<=>x-5=2274
<=>x=2279
b)20-[(x-5)+4]=2
<=>(x-5)+4=18
<=>x-5=14
<=>x=19
c)[(6x-72):2-84].14=2814
<=>(6x-72):2-84=201
<=>(6x-72):2=285
<=>6x-72=570
<=>6x=642
<=>x=107
Những dạng này ko khó chút nào em động não tí là ra à :D
\(\frac{70}{3}\left(\frac{39}{30}+\frac{39}{42}\right)-\frac{246}{7}\div\left(\frac{41}{56}+\frac{41}{72}\right)\)
\(=\frac{70}{3}\left(\frac{13}{10}+\frac{13}{14}\right)-\frac{246}{7}\div\left(\frac{41}{7\cdot8}+\frac{41}{8\cdot9}\right)\)
\(=\frac{70}{3}\left(1+\frac{3}{10}+1-\frac{1}{14}\right)-\frac{246}{7}\div\left(\frac{40+1}{7\cdot8}+\frac{40+1}{8\cdot9}\right)\)
\(=\frac{70}{3}\left[\left(1+1\right)+\left(\frac{3}{10}-\frac{1}{14}\right)\right]-\frac{246}{7}\div\left(\frac{5}{7}+\frac{1}{7\cdot8}+\frac{5}{9}+\frac{1}{8\cdot9}\right)\)
\(=\frac{70}{3}\left(2+\frac{8}{35}\right)-\frac{246}{7}\div\left[\frac{5}{7}+\frac{5}{9}+\left(\frac{1}{7\cdot8}+\frac{1}{8\cdot9}\right)\right]\)
\(=\frac{70}{3}\cdot\frac{78}{35}-\frac{246}{7}\div\left[\frac{5}{7}+\frac{5}{9}+\left(\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\right]\)
\(=\frac{35\cdot2\cdot26\cdot3}{3\cdot35}-\frac{246}{7}\div\left(\frac{5}{7}+\frac{5}{9}+\frac{1}{7}-\frac{1}{9}\right)\)
\(=52-\frac{246}{7}\div\left[\left(\frac{5}{7}+\frac{1}{7}\right)+\left(\frac{5}{9}-\frac{1}{9}\right)\right]\)
\(=52-\frac{246}{7}\div\left(\frac{6}{7}+\frac{4}{9}\right)\)
\(=52-\frac{246}{7}\div\frac{82}{63}\)
\(=52-\frac{82\cdot3\cdot9\cdot7}{7\cdot82}\)
\(=52-27=25\)
\(\frac{57}{20}-\frac{26}{15}+\frac{139}{20}\div3\)
\(=\frac{57}{20}-\frac{26}{15}+\frac{139}{60}\)
\(=\frac{171}{60}-\frac{104}{60}+\frac{139}{60}=\frac{103}{30}\)
\(\frac{39}{4}+\frac{2}{3}\left(11-\frac{23}{4}\right)\)
\(=\frac{39}{4}+11\cdot\frac{2}{3}-\frac{23}{4}\cdot\frac{2}{3}\)
\(=\frac{39}{4}+\frac{22}{3}-\frac{56}{12}\)
\(=\frac{119}{12}+\frac{88}{12}-\frac{56}{12}=\frac{151}{12}\)
\(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)...\left(1-\frac{1}{2002}\right)\left(1-\frac{1}{2003}\right)\left(1-\frac{1}{2004}\right)\)
\(=\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot...\cdot\frac{2001}{2002}\cdot\frac{2002}{2003}\cdot\frac{2003}{2004}\)
\(=\frac{1\cdot2\cdot3\cdot...\cdot2001\cdot2002\cdot2003}{2\cdot3\cdot4\cdot...\cdot2002\cdot2003\cdot2004}=\frac{1}{2004}\)
\(28\cdot\left(231+64\right)+72\cdot\left(230+70\right)\)
\(=28\cdot295+72\cdot300\)\(\)
\(=8260+21600\)
\(=29860\)