15 - 5 x x = 40
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(-15)\(x\) = - 45
\(x\) = - 45 : (-15)
\(x\) = 3
Vậy \(x=3\)
(-15)\(x\) = 10.(-40).(-5)
-15\(x\) = -400.(-5)
-15\(x\) = 2000
\(x\) = 2000 : (-15)
\(x\) = - \(\dfrac{400}{3}\)
Vậy \(x=-\dfrac{400}{3}\)
x+12 = 40- x- 5- 15- x
x+12 = 40 - 5 - 15- x- x
x + 12 = 20
x = 20 - 12
x = 8
-2x - 40 = (5 - x) - (-15 + 60)
-2x - 40 = (5 - x) - 45
-2x - 40 = -40 - x
-2x - x = 40 - 40
-3x = 0
x = 0
2(x - 4) - 3(x + 7) = 14
2x - 8 - 3x - 21 = 14
-x - 29 = 14
-x = 14 + 29
-x = 43
x = -43
-7(5 - x) - 2(x - 10) = 15
-35 + 7x - 2x + 20 = 15
-15 + 5x = 15
5x = 15 + 15
5x = 30
x = 6
3 x 15 + 21 x 15 + 85 x 5
= 45 + 315 + 425
= 785
15 - 30 + 40
= 25
21 + 19 - 50 + 10
= 0
\(\dfrac{1}{5}-\dfrac{1}{4}+2\)
\(=-\dfrac{1}{20}+2\)
\(=\dfrac{39}{20}\)
\(\left(\dfrac{1}{4}+\dfrac{1}{6}\right)\times\left(\dfrac{1}{2}-\dfrac{1}{4}\right)\)
\(=\dfrac{5}{12}\times\dfrac{1}{4}\)
\(=\dfrac{5}{12}\times\dfrac{3}{12}\)
\(=\dfrac{5}{48}\)
\(\dfrac{1}{10}+\dfrac{1}{5}-\dfrac{3}{4}\)
\(=-\dfrac{9}{20}\)
\(3\times15+21\times15+85\times5\\ =15\times\left(3+21\right)+425\\ =15\times24+425\\ =360+425\\ =785\)
\(15-30+40\\ =\left(15+40\right)-30\\ =55-30\\ =25\)
\(21+19-50+10\\ =\left(21+19\right)-\left(50-10\right)\\ =40-40\\ =0\)
\(\dfrac{1}{5}-\dfrac{1}{4}+2\)
\(=\dfrac{4}{20}-\dfrac{5}{20}+\dfrac{40}{20}\)
\(=\dfrac{\left(4+40\right)}{20}-\dfrac{5}{20}\)
\(=\dfrac{44}{20}-\dfrac{5}{20}\)
\(=\dfrac{39}{20}\)
\(\left(\dfrac{1}{4}+\dfrac{1}{6}\right)\times\left(\dfrac{1}{2}-\dfrac{1}{4}\right)\)
\(=\dfrac{5}{12}\times\dfrac{1}{4}\)
\(=\dfrac{5}{48}\)
\(\dfrac{1}{10}+\dfrac{1}{5}-\dfrac{3}{4}\)
\(=\dfrac{2}{20}+\dfrac{4}{20}-\dfrac{15}{20}\)
\(=\dfrac{6}{20}-\dfrac{15}{20}\)
\(=-\dfrac{9}{20}\)
(X+40)x15+(60+x)*5=2000
x*15+40*15+60*5+x*5=2000
x*(15+5)+600+300=2000
x*20+900=2000
x*20=2000-900
x*20=1100
x=1100:20
x=55
-2x-40=(5-x)-(-15+60)
-2x-40=5-x+15-60
-2x+x=15-60+40
-x=-5
x=5
Vậy x=5
<=> -2 . x - 40 = 5 - x - 15 - 60
<=>-2x + x = 5 - 15 - 60 + 40
<=> -x = -30
<=> x = 30
-2x-40=(5-x)-(-15+60)
=> -2x - 40 = 5 - x + 15 +60
=> -2x - 40 = 80 - x
=> -2x + x = 80 + 40
=> -x = 120
-2x-40=(5-x)-(-15+60)
-2x - 40 = 5 - x - 45
-2x - 40 = -x - 40
-2x + x = -40 + 40
-1x = 0
x = 0
\(15-5\times x=40\)
\(5\times\left(3-x\right)=40\)
\(3-x=8\)
\(x=-5\)
Học tốt~
\(15-5\cdot x=40\)
\(5\cdot x=15-40\)
\(5\cdot x=-25\)
\(x=-3\)