X x 7 = 4396

X       = 4396 : 7

X       = 628

x x 7=4396

=>x=4396:7

=>x=628

ai k mh mh k lại

k cho mh nhaTrang Xí XỘn

X = 628 nhé

a)15/8+3/4-5/12

=45+18-10/24

=53/24

b)11/24.12/33+5/6

=11.12/12.2.11.3+5/6

=1/6+5/6

=6/6=1

c)15/8+7/24:5/8

=15/8+7/24.8/5

=15/8+7.8/3.8.5

=15/8+7/15

=đề sai, nếu đúng thì như này

=8/15+7/15

=15/15=1

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8 x 6 = 48

8 x7 = 56

8 x 8 = 64

8 x 9 = 72

48 : 8 = 6

56 : 8 = 7

64 : 8 = 8

72 : 8 = 9

(-12)x7+(-8)x7+4x(-25)+(-6)x(-25)=(-12-8)x7+(-25)(4x-6x)=7x(-20)+(-25)(-2x)=-140x+50x=-90x

tk cho mk đi. mk giải cho nhưng tk cho mk trước đã

\(x\div\dfrac{2}{3}+\dfrac{4}{5}=\dfrac{8}{7}\times\dfrac{7}{10}\)

\(x\div\dfrac{2}{3}+\dfrac{4}{5}=\dfrac{4}{5}\)

\(x\div\dfrac{2}{3}=0\)

\(x=0\)

\(x\div\dfrac{2}{3}+\dfrac{4}{5}=\dfrac{8}{7}\cdot\dfrac{7}{10}\)

\(x\cdot\dfrac{3}{2}+\dfrac{4}{5}=\dfrac{4}{5}\)

\(x\cdot\dfrac{3}{2}=\dfrac{4}{5}-\dfrac{4}{5}=0\)

\(x=0\div\dfrac{3}{2}=0\)

Vậy x = 0

\(x\cdot\dfrac{3}{2}+\dfrac{4}{5}=\dfrac{8}{7}\cdot\dfrac{7}{10}\)

\(\dfrac{3}{2}x+\dfrac{4}{5}=\dfrac{4\cdot2\cdot7}{7\cdot2\cdot5}=\dfrac{4}{5}\)

\(\dfrac{3}{2}x=\dfrac{4}{5}-\dfrac{4}{5}=0\)

\(\Rightarrow x=0\)

(y-18)x7-270:45=169

(y-18)x7-6=169

(y-18)x7=175

y-18=175:7

y-18=25

y=25+18

y=43

    Vậy y=43

(y - 18) x 7 - 270 : 45 = 169

(y - 18) x 7 - 6           = 169 

(y - 18) x 7                = 169 + 6

(y - 18) x 7                = 175

 y - 18                       = 175 : 7

 y - 18                       = 25

 y - 18                       = 25 + 18

 y                              = 43