a) \(101x-x+72.99+72=21050\)

\(100x+72.\left(99+1\right)=21050\)

\(100x+72.100=21050\)

\(\left(x+72\right).100=21050\)

\(x+72=210,5\)

\(x=138,5\)

b) \(x:4+x:0,125=9,9\)

\(x:\left(4+0,125\right)=9,9\)

\(x:4,125=9,9\)

\(x=40,8375\)

c) \(1,5x-5,7=5,3\)

\(1,5x=11\)

\(x=\frac{22}{3}\)

minh cung ko biet lam nua 

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,\(\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+...+\left(x+26\right)=210\)\(=>12x+\left(4+6+8+...+26\right)=210\)

\(=>12x+180=210=>12x=30\)

\(=>x=\frac{30}{12}=\frac{15}{6}=\frac{5}{2}\)

a x 101 - a + 72 x 99 + 72 = 21500

a x 101 - a + 72 x 99 + 72 = a x 101 - a x 1 + 72 x 99 + 72 x 1 = a x (101 - 1) + 72 x (99 + 1) = a x 100 + 72 x 100 = (a + 72) x 100 = 21500.

a + 72 = 21500 : 100 = 215.

a + 72 = 215=> a = 215-72

a=143

a  x 101 - a + 72 x 99 + 72 = 21500

a x ( 101 - 1 ) + 72 x ( 99+ 1 ) = 21500

a x 100  + 72 x 100 = 21500

a x 100   + 7200   = 21500

a x 100                    = 21500 - 7200

a x 100                    =14300

a                              = 143 00 : 100

a                                = 143 

143 nha

Em cần làm gì với biểu thức này?