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Lời giải:
3 tẻ + 4 nếp = 610
2 x (3 tẻ + 4 nếp) = 2 x 610
6 tẻ + 8 nếp = 1220 (1)
Lại có:
6 tẻ + 5 nếp = 970 (2)
Lấy phép tính (1) trừ phép tính (2) theo vế:
8 nếp - 5 nếp = 1220-970
3 nếp = 250
nếp = $\frac{250}{3}$
3 tẻ = 610 - 4 nếp = $610-4\times \frac{250}{3}=\frac{830}{3}$
tẻ = $\frac{830}{3}:3=\frac{830}{9}$
Vậy 1 bao gạo nếp nặng $\frac{250}{3}$ kg, 1 bao gạo tẻ nặng $\frac{830}{9}$ kg.
44 diet
45 medical
46 skillful
47 may
48 much
49 either
50 taking
Ex1
0 Lan is in grade 7
1 She likes learning E
2 She always wants to improve her E
3 Last week, she bought an English-Vietnamese dictionary
4 She often uses it for reading
5 Now she speaks E well
EX2
0 Viet is my friend
1 He likes playing sports very much
2 In his free time, he often plays soccer with his friends
3 He likes watching soccer matches on TV
4 He also likes fishing
5 On the weekends he often goes fishing with his father or brother
( 125 x 0,75 + 125 x 25% ) x ( 9 x 11 - 0,9 x100 - 0,9 x10)
=( 125 x 0,75 + 125 x 25% ) x 0
= 0


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