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Đổi 4dm 5cm = 45cm
Số đoạn cắt được là .
45 : 5 = 9 ( đoạn )
Số lần cắt để được các đoạn là .
9 x 2 = 18 ( lần )
Đáp số : 9 đoạn , 18 lần
4 dm 5cm= 45dm.
Nêu cắt mỗi đoạn 5cm, ta sẽ cắt được tổng cộng: 45/5 = 9 đoạn.
Lấy đoạn kẽm, gấp thành 9 đoạn bằng nhau, ca91t ra 1 doạn ta có chiều dài đoạn đó là 5cm.
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Được 4 đoạn , đúng chắc chắn luôn bạn ạ ,k cho mình nhé !
Bà làm được số bông hoa là
7,65:0,85=9(bông hoa)
đáp số : 9 bông hoa
2,8m=28dm
số đoạn là:
28:4=7(đoạn)
số lần cưa là:
7-1=6(lần)
họ làm hết là:
6*20=120(phút)
120 phút=2giờ
đáp số:2giờ.
Nếu ko có 3 điểm nào thẳng hàng thì vẽ đc 45 đường thẳng và 90 tia
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