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2022-11-14 20:20:46
Đáp án: C
2022-11-14 20:18:33
Đáp án: D
2022-11-14 20:13:12
3x=147
x=147:3
x=49
26-(5+3x)=12
5+3x=26-12
5+3x=14
3x=14-5
3x= 9
x=9:3=3
2022-11-14 20:09:41
Ta gọi: số cây Hương trồng đc là h
số cây Lan trồng đc là l
Mà hai bạn Hương và Lan trồng đc 30 cây :
=> h+l=30
Lại có: Số cây Lan trồng gấp đôi số cây Hương trồng nên:
l=hx2
=2h
=>h+l= h+2h=30
3h =30
h = 30:3=10
=> l=2h=2.10=20
Vậy Hương trồng đc 10 cây, Lan trồng đc 20 cây