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co lam thi moi duoc khen ko lam ma doi duoc khen thif khen ca i dau ...khen cut
0,5.x + 0,25.x + 0,125.x + 0,0625.x = 2
=> x(0,5 + 0,25 + 0,125 + 0,0625) = 2
=> x.0,9375 = 2
=> x = 2 : 0,9375
=> x = 2,13333...
=x.(0,5+0,25+0,125+0,0625)=2
=x.0,9375=2
suy ra x=2:0,9375
x=2,1333
5 x X + X : 0,25 + X : 0,125 = 170
<=> 5 x X + X x 4 + X x 8 = 170
=> X x (5 + 4 + 8) = 170
=> X x 17 = 170
=> X = 170 : 17
=> X = 10
\(5x+x:0,25+x:0,125=170\)
\(5x+x.4+x.8=170\)
\(x\left(5+4+8\right)=170\)
\(17x=170\)
\(\Rightarrow x=10\)
a,\(2,5.16,27.4+7,3=16,27.10+7,3=162,7+7,3=170\)
b,\(8.6.10+4.25.12+3.16.31+2.34.24=48.10+48.25+48.31+48.34\)
\(=48.\left(10+25+31+34\right)=48.100=4800\)
c,\(78.31+78.24+78.17+22.72=78\left(31+24+17\right)+22.72=78.72+22.72\)
\(=72.\left(78+22\right)=72.100=7200\)
d,\(102.67-34.51=102.67-17.102=102.\left(67-17\right)=102.50=5100\)
đéo hiểu thì cút nhé đéo ai khiến m trả lời cả . ngu thì nói ngu đi đừng bày đặt t ghét nhất là cái loại như m đấy ạ
Bài 2
a, \(1-\left(12,5+x-4,25\right):21,75=0\)
\(=>21,75-12,5-x+4,25=0\)
\(=>13,5-x=0=>x=13,5\)
b,\(x.101-x+72.99+72=21050\)
\(=>100x+72.100=21050\)
\(=>100\left(x+72\right)=21050\)
\(=>x+72=210,5\)\(=>x=138,5\)
c,\(151-2\left(x-6\right)=2227:17\)
\(=>151-2\left(x-6\right)=131\)
\(=>2\left(x-6\right)=20\)
\(=>2x=32=>x=16\)
d,\(\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+...+\left(x+26\right)=210\)\(=>12x+\left(4+6+8+...+26\right)=210\)
\(=>12x+180=210=>12x=30\)
\(=>x=\frac{30}{12}=\frac{15}{6}=\frac{5}{2}\)
Giải:
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(100.x+\left(1+2+3+...+100\right)=5750\)
Số số hạng \(\left(1+2+3+...+100\right)\) là: \(\left(100-1\right):1+1=100\)
Tổng dãy \(\left(1+2+3+...+100\right)\) là: \(\left(1+100\right).100:2=5050\)
\(\Rightarrow100.x+5050=5750\)
\(100.x=5750-5050\)
\(100.x=700\)
\(x=700:100\)
\(x=7\)
\(x+x:0,5+x:0,25+x:0,125=150\)
\(x.\left(1+2+4+8\right)=150\)
\(x.15=150\)
\(x=150:15\)
\(x=10\)
Chúc bạn học tốt!
\(\frac{1+0,6-\frac{3}{7}}{\frac{8}{3}+\frac{8}{5}-\frac{8}{7}}=\frac{\frac{3}{3}+\frac{3}{5}-\frac{3}{7}}{\frac{8}{3}+\frac{8}{5}-\frac{8}{7}}=\frac{3.\left(\frac{1}{3}+\frac{1}{5}-\frac{1}{7}\right)}{8.\left(\frac{1}{3}+\frac{1}{5}-\frac{1}{7}\right)}=\frac{3.1}{8.1}=\frac{3}{8}\)
\(\frac{\frac{1}{3}+0,25-\frac{1}{5}+0,125}{\frac{7}{6}+\frac{7}{8}-0,7+\frac{7}{16}}=\frac{\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\frac{1}{8}}{\frac{7}{6}+\frac{7}{8}-\frac{7}{10}+\frac{7}{16}}=\frac{1.\left(\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\frac{1}{8}\right)}{7.\left(\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\frac{1}{8}\right)}=\frac{1.1}{7.1}=\frac{1}{7}\)
=>\(\frac{3}{8}-\frac{1}{7}=\frac{13}{56}\)
=> 3x+5 - 1/2x + 1/4 =2x-1/8
=> 5/2x+21/4=2x-1/8
=>5/2x+21/4+1/8=2x
=>5/2x+43/8=2x=>2x-5/2x=43/8
=>-1/2x=43/8=>x=-43/4
cảm ơn bạn nha