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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: Solve each equation. Also, for each step, state the property of equality used. 1. ???? − 11 = 29 2. 16 = ???? + 20 3. 7 = 1 +

Toán Lớp 7: Solve each equation. Also, for each step, state the property of equality used.
1. ???? − 11 = 29
2. 16 = ???? + 20
3. 7 = 1 + ????
4. −9???? = 153
5. 2???? = −20
6. 12 = ???? − 1
7. ????/ 4= −13
8. −30 = −18 + ????
9. ???? + 15 = 32
10. −30 = ???? − 15

Comments ( 1 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     1, r-11=29
    =>r=29+11
    =>r=40
    2,16=x+20
    =>x=16-20
    =>x=-4
    3. 7 = 1 + n
    =>n=7-1
    =>n=6    
    4. −9r = 153
    =>r=153:(-9)
    =>r=-17     
    5. 2m= −20      
    =>m=-20:2
    =>m=-10 
    6. 12 = m − 1   
    =>m=12+1
    =>m=13  
    7. x/ 4= −13     
    =>x=-13.4
    =>x=-52 
    8. −30 = −18 + k   
    =>k=-30+18
    =>k=-12   
    9. n+ 15 = 32       
    =>n=32-15
    =>n=17 
    10. −30 = x − 15
    =>x=-30+15
    =>x=-15
    (Bài tham khảo)

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222-9+11+12:2*14+14 = ? ( )

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