# Toán Lớp 5: 1. How many pieces of rope of 160cm long are needed to enclose a square of area 100 square meters? 2. How many distinct 4-digit even nu

By Phi Nhung

Toán Lớp 5: 1. How many pieces of rope of 160cm long are needed to enclose a square of area 100 square meters?
2. How many distinct 4-digit even numbers can be created using the digits 0,1,2,3 and 4?
CÁC GIA SƯ ƠI GIÚP MK VỚI HỨA CHO 5 SAO + TL HAY NHẤT VÀ CẢM ƠN CHO NGƯỜI NHANH NHẤT VÀ ĐÚNG

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1)
Exchange 160cm = 1.6m
The area of the square is 100m^2
=> The side of the square is 10m because
10 × 10 = 100
The number of pieces of wire 160cm long to take to wrap a square with an area of
100 m^2 is : 10 : 1.6 = 6.25 ( paragraph )
Change 6.25 = 6 1/4 paragraph
Answer: 6 1/4 paragraph
2)
The units digit has 3 choices (since it’s an even number, the units digit can only be 0, 2 or 4 )
Tens digit has 4 choices
Hundreds digit has 3 choices
The thousands digit has 1 choice
So it is possible to generate all even 4 digit numbers that are different:
3 × 4 × 3 × 1 = 36 ( number )

Trả lời
2. Giải đáp:

Lời giải và giải thích chi tiết:
1.Lenght of the side of a square is:
100:10=10 (m)
10 m= 1000 cm
Perimeter of a square is:
1000×4=4000 cm
The number of pieces we need to enclose a square is:
4000: 160= 25( pieces)
xIn lỗi bài 2 mình hok thấy

Trả lời