a) 5 × x + 3 × x =1096

x × ( 5 + 3 ) = 1096

x × 8 = 1096

x = 1096 :8

x = 137

b) 189 : x - 37 : x=8

( 189 - 37 ) : x = 8

152 : x = 8

x = 152 : 8

x = 19

ủng hộ nha 

a , 5 X x + 3 X x = x X ( 5+3 ) = x X 8 = 1096

=> x = 1096 : 8 = 137.

b , 189 : x - 37 : x = ( 189-37 ) : x = 152 : x = 8

=> x = 152 : 8 = 19.

\(\frac{637\cdot526+637-189}{526\cdot637+448}\)=\(\frac{637\cdot526+448}{637\cdot526+448}\)=1

= 1 nhé

\(\frac{189}{209}\)x\(\frac{1291}{3290}=\frac{3483}{9823}\)

muốn mình giúp thêm thì cứ inbox mình trên olm nha

x=65/164

\(\frac{13}{4}:x+\frac{4}{5}=9\)

\(\frac{13}{4}:x=9-\frac{4}{5}=\frac{41}{5}\)

\(x=\frac{13}{4}:\frac{41}{5}\)

\(x=\frac{65}{164}\)

\(\left(2.8x-32\right):\frac{2}{3}=90\)

\(2.8\cdot x-32=90\cdot\frac{2}{3}\)

\(\frac{14}{5}x-32=60\)

\(\frac{14}{5}x=60+32\)

\(\frac{14}{5}x=92\)

\(x=\frac{230}{7}\)

B , c , d tương tự

Bài 5: Tính bằng cách thuận tiện nhất

a) 189 x 6 + 189 x 5 - 189

=189x(6+5-1)

=189x10

=1890

b) 25 x 86 x 4

=25x4x86

=100x86

=8600

HT

Ừ BẠN LÀM ĐÚNG RỒI

\(a,\left(\frac{5}{7}+\frac{9}{7}\right)x\frac{21}{28}\)

\(C1:=\frac{14}{7}x\frac{21}{28}=\frac{3}{2}\)

\(C2:=\frac{5}{7}x\frac{21}{28}+\frac{9}{7}x\frac{21}{28}=\frac{15}{28}+\frac{27}{28}=\frac{3}{2}\)

\(b,\frac{4}{5}x\frac{13}{14}+\frac{13}{14}x\frac{1}{5}\)

\(C1:=\frac{26}{35}+\frac{13}{70}=\frac{13}{14}\)

\(C2:=\frac{13}{14}x\left(\frac{4}{5}+\frac{1}{5}\right)=\frac{13}{14}x1=\frac{13}{14}\)

học tốt ~~~

Cảm ơn bạn!

=> x/4 = 15/12 - 13/20

=> x/4 = 3/5

=> x = 3/5 x 4 

=> x = 12/5

Tk mk nha

\(a.\frac{4}{5}\times\frac{3}{x}\times\frac{2}{11}=\frac{24}{165}\)

\(\frac{3}{x}=\frac{24}{165}:\frac{4}{5}:\frac{2}{11}\)

\(\frac{3}{x}=1\)

\(\Rightarrow x=3\)

\(b.\frac{4}{3}:\frac{x}{5}=\frac{5}{13}\times\frac{4}{9}\)

\(\frac{4}{3}\times\frac{5}{x}=\frac{20}{117}\)

\(\frac{5}{x}=\frac{20}{117}:\frac{4}{3}\)

\(\frac{5}{x}=\frac{5}{39}\)

\(\Rightarrow x=39\)

Đúng nha