請幫我解答以下的數學題:
Solve the following equations
1. 2y+3-4(y+3)=-7
2. 2y+1=4-(3y-7)
3. 0.3(x+5)-0.1(2x-1)=1.84
4.1/4(x-1)-1/6=0.06
5. x-3/4=x+2/3
6. Write down all the composite number from 31 to 59
Composite numbers from 31 to 59 are_______________
7.Find the difference between the largest prime number and the smallest
prime number from 120 to 190
The required difference=___________-___________=_______________
Mathe
2008-07-22 2:23 am
回答 (2)
2008-07-23 4:01 pm
1 :
2y+3-4(y 3) = -7
2y+3-4y-12 = -7
-2y = -7-3+12
-2y = 2
y = -1
2 :
2y+1 = 4-(3y-7)
2y+1 = 4-3y+7
2y+3y = 11-1
5y = 10
y = 2
3 :
0.3(x+5)-0.1(2x-1) = 1.84
0.3x+1.5-0.2x+0.1 = 1.84
0.1x = 1.84-1.5-0.1
0.1x = 0.24
x = 2.4
4 : 1/[4(x-1)] - 1/6 = 0.06 <----- 估計你的題目是這樣
1/[4x-4] = 3/50 + 1/6
1/[4x-4] = 17/75
75 = 17(4x-4)
75 = 68x-68
x = 143/68
x = 2.10
5 : (x-3)/4 = (x+2)/3 <----- 估計你的題目是這樣
3(x-3) = 4(x+2)
3x-9 = 4x+8
3x-4x = 8+9
-x = 17
x = -17
6 : 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58
7 : 181 - 127 = 54
2008-07-25 11:36:16 補充：
第七題取錯數，重新再算。
應該是：187 - 121 = 66
2y+3-4(y 3) = -7
2y+3-4y-12 = -7
-2y = -7-3+12
-2y = 2
y = -1
2 :
2y+1 = 4-(3y-7)
2y+1 = 4-3y+7
2y+3y = 11-1
5y = 10
y = 2
3 :
0.3(x+5)-0.1(2x-1) = 1.84
0.3x+1.5-0.2x+0.1 = 1.84
0.1x = 1.84-1.5-0.1
0.1x = 0.24
x = 2.4
4 : 1/[4(x-1)] - 1/6 = 0.06 <----- 估計你的題目是這樣
1/[4x-4] = 3/50 + 1/6
1/[4x-4] = 17/75
75 = 17(4x-4)
75 = 68x-68
x = 143/68
x = 2.10
5 : (x-3)/4 = (x+2)/3 <----- 估計你的題目是這樣
3(x-3) = 4(x+2)
3x-9 = 4x+8
3x-4x = 8+9
-x = 17
x = -17
6 : 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58
7 : 181 - 127 = 54
2008-07-25 11:36:16 補充：
第七題取錯數，重新再算。
應該是：187 - 121 = 66
參考: 自己計算及參考維基百科, 自己
2008-07-22 8:16 pm
6.
32,33,34,35,36,38,39,40,42,44,45,46,48,50,51,52,54,55,56,57,58
7.
187-121
=66
r u the wong siu ching secondary school school student???
32,33,34,35,36,38,39,40,42,44,45,46,48,50,51,52,54,55,56,57,58
7.
187-121
=66
r u the wong siu ching secondary school school student???
參考: me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
收錄日期: 2021-04-15 17:36:49
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