各位知識朋友 , 入黎幫我手 ar !!! ( 數學題 F.1 ) (9)

1.)3x+11=32
2.)8y-7=81
3.)z/7 +5=18
4.)2(50+x)=220
5.)x+x+1+x+2=63

1)32-11=21
3x=21

2)8y-7=81

3)z/7+5=18

4)2(50+x)=220

5)設n是其中一個連續數
n+n+1+n+2=63

1. 3x+11=32
3x=32-11
x=21/3
x=7
2. 8y-7=81
8y=81+7
y=88/8
y=11
3. z/7+5=18
z/7=18-5
z=13x7
z=91
4. 設長方形花園的闊是x m
50x2+2x=220
100+2x=220
2x=220-100
x=120/2
x=60
∴長方形花園的闊是60m
5. y+y+1+y+2=63
y+y+y=63-1-2
3y=60
y=60/3
y=20
三個連續數是20,21,22

．= 乘(乘數點)

1).
x．3+11=32
3x+11-11=32-11
3x÷3=21÷3
x=7

2).
y．8-7=81
8y-7+7=81+7
8y÷8=88÷8
y=11

3).
z÷7+5=18
z÷7+5-5=18-5
z÷7．7=13．7
z=91

4).
因為長方形 周界 =長．闊
所以50．x=220
50x÷50=220÷50
x=4.4m

5).設最少連續數為x,
x+(x+1)+(x+2)=63
x+x+x+2+1=63
3x+3-3=63-3
3x÷3=60÷3
x=20

所該三個連續數是20,21,22

1. 己知x的3倍與11之和是 32, 求x
........3x+11=32
..............3x=32-11
...............x=21/3
...............x=7
2.己知y的8倍減7是 81, 求y
8y-7=81
...8y=88
....y=11
3.z除以7後再加5的結果是18, 求z
z/7.+.5=18
......z/7=13
.........z=91
4..長方形花園的長是50 m , 闊是x m, 周界是220 m, 求x的值
2(50+x)=220
....50+x=220/2
....50+x=110
..........x=60
5
設三個連續數分別是,y,y+1,y+2
y+y+1+y+2=63
.........3y+3=63
.............3y=60
..............y=20

1. 3x+11=32
3x=21
x=7
2. 8y-7=81
8y=88
y=11
3. z/7+5=18
z/7=13
z=91
4. (50+x)2=220
50+x=110
x=60
5. x + x+1+x+2=63
3x+3=63
3x=60
x= 20
三個數=20,21,22

this is the best answer u can get, pick me

2007-10-15 22:57:50 補充：
peter siu got u the wrong answer for the last q.

1.3x +11 =32
3x = 21
x = 7
2. 8y -7 =81
8y = 88
y= 11
3. z/7 +5 = 18
z/7= 12
z = 84
4. 100 + 2x = 220
2x= 120
x = 60
5. x+ (x+1) + (x+2) =63
3x + 3 =63
3x = 60
x = 20