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bogum515

2 năm trước

Loga Sinh Học lớp 12

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nguyenduychuongmy

$@Zyy$

$Xin$ $ctrlhn$ $ạ$

$B1$

$a.71+x=126$

$x=126-71$

$x=55$

Vậy x=55

$b.(x+3)+26=76$

$x+3=76-26$

$x+5=50$

$x=50-5$

$x=45$

Vậy x=45

$c.45+(x+9)=56$

$x+9=56-45$

$x+9=11$

$x=11-9$

$x=2$

Vậy x=2

$d.89+(73-x)=120$

$73-x=120-89$

$73-x=31$

$x=73-31$

$x=42$

Vậy x=42

$e.(2x-6)-25=13$

$2x-6=13+25$

$2x-6=38$

$2x=38+6$

$2x=44$

$x=44:2$

$x=22$

Vậy x=22

$g.198+(2x+4)=220$

$2x+4=220-198$

$2x+4=22$

$2x=22-4$

$2x=18$

$x=18:2$

$x=9$

Vậy x=9

$B2$

$a.71-(33+x)=26$

$33+x=71-26$

$33+x=45$

$x=45-33$

$x=12$

Vậy x=12

$b.(x+73)-26=76$

$x+73=76+26$

$x+73=102$

$x=102-73$

$x=29$

Vậy x=29

$c.45-(x+9)=6$

$x+9=45-6$

$x+9=39$

$x=39-9$

$x=30$

Vậy x=30

$d.89-(73-x)=20$

$73-x=89-20$

$73-x=69$

$x=73-69$

$x=4$

Vậy x=4

$e.(x+7)-25=13$

$x+7=12+25$

$x+7=37$

$x=37-7$

$x=30$

Vậy x=30

$g.198-(x+4)=120$

$x+4=198-120$

$x+4=78$

$x=78-4$

$x=74$

Vậy x=74

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Đáp án+Giải thích các bước giải:

$Bài$ $1$

$a)$ $71+x=126⇒x=126-71=55$

$b)$ $(x+3)+26=76⇒x+3=76-26=50⇒x=50-3=47$

$c)$ $45+(x+9)=56⇒x+9=56-45=11⇒x=11-9=2$

$d)$ $89+(73-x)=120⇒73-x=120-89=31⇒x=73-31=42$

$e)$ $(2x-6)-25=13⇒2x-6=13+25=38⇒2x=38+6=44⇒x=44:2=22$

$g)$ $198+(2x+4)=220⇒2x+4=220-198=22⇒2x=22-4=18⇒x=18:2=9$

$Bài$ $2$

$a)$ $71-(33+x)=26⇒71-33+x=26⇒38+x=26⇒x=26-38=-12$

$b)$ $(x+73)-26=76⇒x+73=76+26=102⇒x=102-73=29$

$c)$ $45-(x+9)=6⇒45-x-9=6⇒36-x=6⇒x=36-6=30$

$d)$ $89-(73-x)=20⇒89-73+x=20⇒16+x=20⇒x=20-16=4$

$e)$ $(x+7)-25=13⇒x+7=13+25=38⇒x=38-7=31$

$g)$ $198-(x+4)=120⇒198-x-4=120⇒194-x=120⇒x=194-120=74$

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