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

Question

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

hienchaudiem · Answer

Answer:         1)         Exchange 160cm = 1.6m         The area of the square is 100m^2         => The side of the square is 10m because          10 &times; 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 &times; 4 &times; 3 &times; 1 = 36 ( number )            Answer: 36 numbers

thienthanh · Answer

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:   1000x4=4000 cm   The number of pieces we need to enclose a square is:   4000: 160= 25( pieces)   xIn lỗi b&agrave;i 2 m&igrave;nh hok thấy