Jawabanmu

2014-06-11T19:18:12+07:00
1. 21.000 : 6 = 3500.... 30 buku x 3500 = 105000
yg lain nya mana
bentar...
2. pakai perbandingan berbalik... 8/6 = 12/x ...... 8x = 12*6...... 8x = 72..... x= 72:8...... x = 9
4. 3a + 5 = a + 7 .... 3a -a = 7-5... 2a=2... a = 2:2 = 1... maka nilai a+17 = 18
2014-06-11T19:33:57+07:00
1. 21000 ÷6 = 3500
3500 . 30 = 105000

2. 8 = 12
6 = ?
caranya 8.12 = 96
96 ÷6 = 16 orang

3.
9 ÷ 12 = 0,75 % ( sebulan)
920000 - 800000= 120000
0,75 % . 800000 = 6000
120000 ÷ 6000 = 20 bulan atau 1 th 8 bln

4.
3a + 5 = a + 7
3a - a = 7 - 5
2a = 2
a = 1

1 + 17 = 18

5. x-3 <2
x < 3+2
x < 5