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Bài giải:
1 giờ người thứ nhất làm được : 1:4=1/4 (công việc)
1 giờ người thứ hai làm được 1:6=1/6 (công việc)
1 giờ người thứ ba làm được 1:12=1/12 (công việc)
1 giờ 3 người làm được 1/4+1/6+1/12=1/2 (công việc)
3 người cùng làm thì sau số giờ cần để hoàn thành công việc là 1:1/2=2 (giờ)
Đáp số: 2 giờ.
Bài giải:
1 giờ người thứ nhất làm được : 1:4=1/4 (công việc)
1 giờ người thứ hai làm được: 1:6=1/6 (công việc)
1 giờ người thứ ba làm được: 1:12=1/12 (công việc)
1 giờ 3 người làm được: 1/4+1/6+1/12=1/2 (công việc)
3 người cùng làm thì sau số giờ cần để hoàn thành công việc là :
1:1/2=2 (giờ)
Đáp số: 2 giờ.
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1 giờ người thứ 1 làm được số phần công việc là 1: 8 = 1/8 ( công việc )
1 giờ người thứ 2 làm được số phần công việc là 1 : 12 = 1/12 ( công việc )
1 giờ cả hai người làm chung thì được số phần công việc là 1/8 + 1/12 = 5/24 ( công việc )
sau số giờ 2 người hoàn thành xong công việc là 1 : 5/24 = 24/5 ( công việc )
Thời gian làm tỉ lệ nghịch số người làm.
Sau khi bị chuyển đi, thời gian để lớp 5A làm xong công việc mất:
4:\(\frac{1}{3}\)=12 ( giờ )
Sau khi bị chuyển đi, thời gian để lớp 5B làm xong công việc mất:
3:\(\frac{1}{2}\)= 6 ( giờ )
Sau khi bị chuyển đi, trong 1 giờ lớp 5A làm được số phần công việc là:
1:12=\(\frac{1}{12}\)( công việc )
Sau khi bị chuyển đi, trong 1 giờ lớp 5B làm được số phần công việc là:
1:6=\(\frac{1}{6}\)( công việc )
Sau khi bị chuyển đi, trong 1 giờ cả hai lớp làm được số phần công việc là:
\(\frac{1}{6}\)+\(\frac{1}{12}\)= \(\frac{1}{4}\) ( công việc )
Sau khi bị chuyển đi, thời gian cả hai lớp làm xong công việc mất:
1:\(\frac{1}{4}\)= 4 ( giờ )
Đ/S: 4 giờ.
1.số gạo trước khi bán:360,8*75:100=270,6
số goạ còn lại trong kho:360,8-270,6=90,2
2.1 giờ người 1 làm đc số công việc là:1:8=1/8
1 giờ người 2 làm đc số công việc là:1:12=1/12
1 giờ cả 2 người làm:1/8+1/12=5/24
2 người làm chung:1:24/5=5/24=4,8 giờ