1 Tìm x 20 – 5 / ( x – 1 ) = 15 17x + x – 4x = 70 42 – ( x+ 1 ) * 3 = 9 70 – 35 * ( x – 3 ) = 35 21/08/2021 Bởi Julia 1 Tìm x 20 – 5 / ( x – 1 ) = 15 17x + x – 4x = 70 42 – ( x+ 1 ) * 3 = 9 70 – 35 * ( x – 3 ) = 35
a , 20 – $\frac{5}{x-1}$ = 15 $\frac{5}{x-1}$ = 20 – 15 = 5 ⇒ x – 1 = 1 x = 1 + 1 = 2 b, 17 x + x – 4x = 70 18x – 4x = 70 14x = 70 ⇔ x=70÷14=5 c, 42 – (x+1) * 3 = 9 (x+1) *3= 42 + 9 = 51 ⇔(x+1) = 51/3 = 17 x= 17-1 = 16 d, 70 – 35 * (x-3) = 35 35 * (x-3) = 70 – 35 = 35 x-3 = 35/35 =1 ⇔x=4 Bình luận
${20}$ – ${5}$ : ( x – ${1}$) = ${15}$ ${15}$ : ( x – ${1}$) =${15}$ x – ${1}$ = ${1}$ x = ${1}$+${1}$ x =${2}$ ${17}$x + x – ${4x}$ = ${70}$ x = ${18x}$ – ${4x}$ x = ${14}$ x = ${70}$ : ${14}$ x =${5}$ ${42}$ – ( x+ ${1}$ ) * ${3}$ = ${9}$ x = x + ${1}$ *${3}$ x =${42}$ +${9}$ x +${1}$ = ${51}$ x +${1}$ = $\frac{51}{3}$ x +${1}$ = ${17}$ x = ${17}$ – ${1}$ x = ${16}$ ${70}$ – ${35}$ * ( x – ${3}$ ) = ${35}$ ${35}$ * ${3}$ = ${70}$ x = ${70}$ – ${35}$ x = ${35}$ x – ${3}$ = $\frac{35}{35}$ = ${1}$ x = ${3}$ + ${1}$ x =${4}$ ${CHO}$ ${CÂU}$ ${TRẢ}$ ${LỜI}$ ${HAY}$ ${NHẤT}$ ${NHA}$ ${VOTE}$ ${VÀ}$ ${CẢM}$ ${ƠN}$ ${NỮA}$ ${NHA}$ ${CHÚC}$ ${HỌC}$ ${TỐT}$ ${!!!!!!!!!!!!}$ Bình luận
a , 20 – $\frac{5}{x-1}$ = 15
$\frac{5}{x-1}$ = 20 – 15 = 5
⇒ x – 1 = 1
x = 1 + 1 = 2
b, 17 x + x – 4x = 70
18x – 4x = 70
14x = 70
⇔ x=70÷14=5
c, 42 – (x+1) * 3 = 9
(x+1) *3= 42 + 9 = 51
⇔(x+1) = 51/3 = 17
x= 17-1 = 16
d, 70 – 35 * (x-3) = 35
35 * (x-3) = 70 – 35 = 35
x-3 = 35/35 =1
⇔x=4
${20}$ – ${5}$ : ( x – ${1}$) = ${15}$
${15}$ : ( x – ${1}$) =${15}$
x – ${1}$ = ${1}$
x = ${1}$+${1}$
x =${2}$
${17}$x + x – ${4x}$ = ${70}$
x = ${18x}$ – ${4x}$
x = ${14}$
x = ${70}$ : ${14}$
x =${5}$
${42}$ – ( x+ ${1}$ ) * ${3}$ = ${9}$
x = x + ${1}$ *${3}$
x =${42}$ +${9}$
x +${1}$ = ${51}$
x +${1}$ = $\frac{51}{3}$
x +${1}$ = ${17}$
x = ${17}$ – ${1}$
x = ${16}$
${70}$ – ${35}$ * ( x – ${3}$ ) = ${35}$
${35}$ * ${3}$ = ${70}$
x = ${70}$ – ${35}$
x = ${35}$
x – ${3}$ = $\frac{35}{35}$ = ${1}$
x = ${3}$ + ${1}$
x =${4}$
${CHO}$ ${CÂU}$ ${TRẢ}$ ${LỜI}$ ${HAY}$ ${NHẤT}$ ${NHA}$ ${VOTE}$ ${VÀ}$ ${CẢM}$ ${ƠN}$ ${NỮA}$ ${NHA}$
${CHÚC}$ ${HỌC}$ ${TỐT}$ ${!!!!!!!!!!!!}$