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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.
Số kg gạo tẻ là:
50 x 32 = 1600 (kg)
Số kg gạo nếp là:
59 x 45 = 2655 (kg)
Vậy có tổng cộng:
1600 + 2655 = 4255(kg) = 4,255 tấn
ĐS: 4,255 tấn
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
T - N = 0,8 => T = N + 0,8
2/3 T = 4/5 N => 2/3 T - 4/5 N = 0 => 2/3 (N +0,8) - 4/5 N = 0
=> 2/3 N + 8/15 - 4/5 N = 0
=> -2/15 N = -8/15 => N = 4 (kg)
T = N + 0,8 = 4 + 0,8 = 4,8 (kg)
Lời giải:
a. Hiệu số phần bằng nhau:
$3-1=2$ (phần)
Số gạo tẻ là: $60:2\times 3=90$ (kg)
Số gạo nếp là: $90-60=30$ (kg)
b.
Buổi sáng bán được: $(90+30)\times \frac{2}{3}=80$ (kg)
Số gạo tẻ bán được là: $(80+40):2=60$ (kg)
Gọi khối lượng bao gạo nếp là a, bao gạo tẻ là b (kg)
Ta có: a+b = 100
a - 2/3b = 15
=> (a+b) - (a-2/3b) = 5/3b = 100-15 = 85
=> b = 85 : 5/3 = 51
=> a = 100-51 = 49
Vậy ...