40 × x = 1400;

x = 1400 : 40

x = 35

a) 40 × x = 1400;

x = 1400 : 40

x = 35

a)40 x 35 =1400

b) 2665 : 13 = 205

a/ x= 1400:40

   x=35

b/x=205.13

x=2665

a) 40 x X = 1400

           X = 1400:40

           X = 35

b) x : 13 = 205

          x = 205 x 13

          x = 2665

a, 40 x \(x\) = 1400

       \(x\) = 1400 : 40

       \(x\) = 35

b, \(x\) : 13 = 205

           \(x\) = 205 x 13

           \(x\) = 2665

x=5600 

 x + 600 = 1400 + 4800

x + 600 = 6200

x          = 5600

vậy: x= 5600

bạn tk mk nha ~~!~~ thank.

a.x=.35

b.x=2665

a .x= 1400 : 40

x =35

b x = 205 x 13

x=2665

đúng 12 nhé kinomoto sakura thủ lĩnh thẻ bài

\(9576:x=1400-1372\)
\(\Rightarrow9576:x=28\)
\(\Rightarrow x=9576:28\)
\(\Rightarrow x=342\)

9576 : x = 28

           x= 9576 : 28

           x= 342

a) 1400 : 20 - (17 + x) = 20

70 - (17 + x) = 20

17 + x = 70 - 20

17 + x = 50

x = 50 - 17

x = 33

b) 8 \(\times\) (x + 15) = 640

x + 15 = 640 : 8 

x + 15 = 80

x = 80 - 15

x = 65

c) x \(\times\) 62 + x \(\times\) 38 = 4200

x  \(\times\) (62 + 38) = 4200

x \(\times\) 100 = 4200

x = 4200 : 100

x = 42

d) x \(\times\) 186 - x \(\times\) 86 = 3400

x \(\times\) (186 - 86) = 3400

x \(\times\) 100 = 3400

x = 3400 : 100

x = 34