14 x 32 + 7x 140 - 28
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14 x 32 + 7x 140 - 28
= 14 x 32 + 7 x 14 x 10 - 14 x 2
= 14 x 32 + 14 x 70 - 14 x 2
= 14 x ( 32 + 70 - 2 )
= 14 x 100
= 1400
17 x 35 + 67 x 17 - 34
= 17 x 35 + 67 x 17 - 2 x 17
= 17 x ( 35 + 67 - 2 )
= 17 x 100
= 1700
\(14+21+28+35+42+...+140\)
Số phần tử trong dãy: \(\dfrac{140-14}{7}+1=19\)
Tổng của dãy trên: \((140+14)\cdot19:2=1463\)
\(-7\left(3x-5\right)+2\left(7x-14\right)=28\)
\(\Leftrightarrow-21x+35+14x-28=28\)
\(\Leftrightarrow-7x=21\)
\(\Leftrightarrow x=-3\)
Vậy : \(x=-3\)
\(-7.\left(3x-5\right)+2.\left(7x-14\right)=28\)
\(\Leftrightarrow-21x+35+14x-28=28\)
\(\Leftrightarrow-7x+7=28\)
\(\Leftrightarrow-7x=21\)
\(\Leftrightarrow x=-3\)
Vậy \(x=-3\)
3x + 4x = 14
7x = 14
x = 2
7x + x + 8x = 32
16x = 32
x = 2
Hk tốt
\(3x+4x=14\) \(7x+x+8x=32\)
\(x\left(3+4\right)=14\) \(x\left(7+8+1\right)=32\)
\(7x=14\) \(16x=32\)
\(x=14:7\) \(x=32:16\)
\(x=2\) \(x=2\)
Tìm x:
\(a.\dfrac{35}{28}-x=\dfrac{5}{14}\\ x=\dfrac{35}{28}-\dfrac{5}{14}\\ x=\dfrac{25}{28}\\ b.\dfrac{6}{7}\times x=\dfrac{2}{3}\\ x=\dfrac{2}{3}:\dfrac{6}{7}\\ x=\dfrac{7}{9}\\ c.x\times7=\dfrac{3}{4}\\ x=\dfrac{3}{4}:7\\ x=\dfrac{3}{28}\\ d.2:x-\dfrac{1}{3}=\dfrac{2}{5}\\ 2:x=\dfrac{2}{5}+\dfrac{1}{3}\\ 2:x=\dfrac{11}{15}\\ x=2:\dfrac{11}{15}\\ x=\dfrac{30}{11}.\)
\(a,\dfrac{35}{28}-x=\dfrac{5}{14}\)
\(x=\dfrac{35}{28}-\dfrac{5}{14}\)
\(x=\dfrac{25}{28}\)
\(b,\dfrac{6}{7}\times x=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}:\dfrac{6}{7}\)
\(x=\dfrac{7}{9}\)
\(c,x\times7=\dfrac{3}{4}\)
\(x=\dfrac{3}{4}:7\)
\(x=\dfrac{3}{28}\)
\(d,2:x-\dfrac{1}{3}=\dfrac{2}{5}\)
\(2:x=\dfrac{2}{5}+\dfrac{1}{3}\)
\(2:x=\dfrac{11}{15}\)
\(x=2:\dfrac{11}{15}\)
\(x=\dfrac{30}{11}\)
#YVA
a) ( -2x - 28 )5 = -32 = ( -2 )5
-2x - 28 = -2
-2x = ( -2 ) + 28 = 26
x = 26 : ( -2 ) = -13
b) ( 7x - 11 )3 = 1000 = 103
7x - 11 = 10
7x = 10 + 11 = 21
x = 21 : 7 = 3
c) ( 3x - 15 )2 - 6 = 75
( 3x - 15 )2 = 75 + 6 = 81 = 92
3x - 15 = 9
3x = 9 + 15 = 24
x = 24 : 3 = 8
\(14\times32+7\times140-28\)
\(=14\times32+7\times10\times14-2\times14\)
\(=14\times\left(32+70-2\right)\)
\(=14\times100\)
\(=1400\)
14x32 + 7x140 - 28
=448+980-28
=1428-28
=1400