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Ta có sơ đồ:
Theo sơ đồ ta có:
Số gạo nếp còn lại là: 320 : (3 + 5) x 3 = 120 (kg)
Sô gạo tẻ còn lại là: 320 - 120 = 200 (kg)
120 ki-lô-gam gạo nếp ưng với phân số là:
1 - \(\dfrac{4}{7}\) = \(\dfrac{3}{7}\) (số gạo nếp ban đầu)
Số gạo nếp ban đầu là:
120 : \(\dfrac{3}{7}\) = 280 (kg)
200 ki-lô-gam ứng với phân số là:
1 - \(\dfrac{5}{9}\) = \(\dfrac{4}{9}\) (số gạo tẻ ban đầu)
Số gạo tẻ ban đầu là:
200 : \(\dfrac{4}{9}\) = 450 (kg)
Đáp số:...
2 tạ 40kg=240kg
Sau khi bán đi 40kg thì số gạo nếp còn lại là:
240:2*3=360(kg)
=>Số gạo nếp ban đầu là 360+40=400(kg)
Số gạo tẻ ban đầu là:
400+240=640(kg)
Sau khi bán đi đi 25kg gạo mỗi loại thì số gạo nếp vẫn nhiều hơn số gạo tẻ là 150kg.
Ta có sơ đồ sau khi bán mỗi loại 25kg gạo :
Gạo tẻ : |-----|-----|
Gạo nếp : |-----|-----|-----|-----|-----|
Hiệu số phần bằng nhau là : 5 - 2 = 3 ( phần )
Có số kg gạo tẻ lúc sau là : 150 : 3 × 2 = 100 ( kg )
Có số kg gạo tẻ lúc đầu là : 100 + 25 = 125 ( kg )
Có số kg gạo nếp lúc đầu là : 125 + 150 = 275 ( kg )
Đáp số : Gạo tẻ lúc đầu : 125kg
Gạo nếp lúc đầu : 275kg
Đổi 1tạ 50kg = 150kg
Sau khi bán đi đi 25kg gạo mỗi loại thì số gạo nếp vẫn nhiều hơn số gạo tẻ là 150kg.
Ta có sơ đồ sau khi bán mỗi loại 25kg gạo :
Gạo tẻ : |-----|-----|
Gạo nếp : |-----|-----|-----|-----|-----|
Hiệu số phần bằng nhau là : 5 - 2 = 3 ( phần )
Có số kg gạo tẻ lúc sau là : 150 : 3 × 2 = 100 ( kg )
Có số kg gạo tẻ lúc đầu là : 100 + 25 = 125 ( kg )
Có số kg gạo nếp lúc đầu là : 125 + 150 = 275 ( kg )
Đáp số : Gạo tẻ lúc đầu : 125kg
Gạo nếp lúc đầu : 275kg
Khối lượng của 30 bao gạo tẻ là:
30 x 40 = 1200 ( kg )
Khối lượng của 40 bao gạo nếp là:
40 x 20 = 800 ( kg )
Đổi : 1200 kg = 1,2 tấn
800 kg = 0,8 tấn
Xe đó chở được số tấn gạo là:
1,2 + 0,8 = 2 ( tấn )
Đáp số : 2 tấn gạo
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Số kg gạo tẻ là:
30.40=1200 (kg)
Số gạo nếp là:
40.20=800 (kg)
Xe chở số tấn gạo là:
800+1200=2000(kg)
2000 kg=2 tấn
Đáp số : 2 tấn
mình chỉ biết câu 1 thôi :
lấy số bao gạo tẻ nhân với cân nặng của bao là 30 x 40 = 1200 kg.
sau đó ta cũng làm như cách kia là : 40 x 20 = 800 kg.
ta cộng 2 tích lại bằng : 1200 + 800 = 2000 kg
1.
30 bao gạo tẻ nặng số ki-lô-gam là :
40 x 30 = 1200 (kg)
40 bao gạo nếp nặng số ki-lô-gam là :
20 x 40 = 800 (kg)
Xe đó chở số gạo là :
1200 + 800 = 2000 (kg)
2000kg = 2 tấn
Đáp số : 2 tấn
2.
1 tạ 50kg = 150 kg
Sau khi bán đi 25kg mỗi loại thì hiệu số gạo vẫn không đổi .
Lúc đầu cửa hàng có số gạo tẻ là :
150 : (5-2) x 5 = 250 (kg)
Lúc đầu cửa hàng có số gạo nếp là :
250 - 150 = 100 (kg)
Đáp số : 250kg gạo tẻ
100kg gạo nếp
3.
a, \(\frac{41}{24}\)
b, \(\frac{194}{65}\)
Bài 3 mình ko chắc lắm.