解方程6題, 20分

1. 5(m-1)=3m-7
5m - 5 = 3m - 7
2m = -2
m = -1
2. 5y-4(3y-2)= -20
5y - 12y + 8 = -20
-7y = -28
y = 4
3. 5(y+4)-6(8+3y)= -2
5y + 20 - 48 - 18y = -2
-13y = 26
y = -2
4. 7k-(99k-16)=14-(19-k )
7k - 99k + 16 = 14 - 19 + k
93k = 21
k = 21 / 93 = 7 / 31
5. 3[4(3.5-9)+1]=13-2q
13 - 2q = -63
-2q = -76
q = 38
6. 2[p-2(p+1)]-1=8p+25
2p - 4p - 4 - 1 = 8p + 25
10p = -30
p = -3

1. 5(m-1)=3m-7
5m - 5 = 3m - 7
2m = -2
m = -1
2. 5y-4(3y-2)= -20
5y - 12y + 8 = -20
-7y = -28
y = 4
3. 5(y+4)-6(8+3y)= -2
5y + 20 - 48 - 18y = -2
-13y = 26
y = -2
4. 7k-(99k-16)=14-(19-k )
7k - 99k + 16 = 14 - 19 + k
93k = 21
k = 21 / 93 = 7 / 31
5. 3[4(3.5-9)+1]=13-2q
13 - 2q = -63
-2q = -76
q = 38
6. 2[p-2(p+1)]-1=8p+25
2p - 4p - 4 - 1 = 8p + 25
10p = -30
p = -3

1.
5(m-1)=3m-7
5m-5=3m-7
2 m=-2
m=-1

2.
5y-4(3y-2)=-20
5y-12y+ 8=-20
-7y=-28
y=4

3.
5(y+4)-6(8+3y)=-2
5y+20-48-18y=-2
-13y=26
y=-2

4.
7k-(99k-16)=14-(19-k )
7k-99k+16=14-19+k
93k=21
k=21/93
k=7/31

5.
3[4(3.5-9)+1]=13-2q
13-2q=-63
-2q=-76
q=38

6.
2[p-2(p+1)]-1=8p+25
2p-4p-4-1=8p+25
10p=-30
p=-3

1.)5(m-1)=3m-7
5m-5=3m-7
5m-3m=--7+5
2m=2
m=1

2.)5y-4(3y-2)= -20
5y-12y+8= -20
-7y= -28
y=4

3)5(y+4)-6(8+3y)= -2
5y+20-48-18y= -2
-13y= -2+28
13y=26
y=13

4.)7k-(99k-16)=14-(19-k)
7k-99k+16=14-19+k
-92k-k=14-19-16
-93k= -21
k=4 7/93

5.)3[4(3.5-9)+1]=13-2q
3[14-36+1]=13-2q
3(-21)=13-2p
-63-13= -2p
-76= -2p
38=p
p=38

6.)2[p-2(p+1)]-1=8p+25
2[p-2p-2)]-1=8p+25
2(-p-2)-1=8p+25
-2p-4-1=8p+25
-2p-5=8p+25
-10p=30
p= -3