Question

Bài tập toán lớp 4 nâng cao số 9
Tìm trung bình cộng của tất cả các số có hai chữ số, mà chia hết cho 4?

Answer 1

Các số có hai chữ số chia hết cho 4 gồm: 12; 16; 20; …….; 92; 96.

Trung bình cộng của dãy số cách đều bằng với trung bình cộng của số đầu và số cuối của dãy số đó.

Trung bình cộng của tất cả các số có hai chữ số, mà chia hết cho 4 là:

(12+96):2 = 54

Đáp số:   54

Answer 2

Ta có dãy số như sau: 12;16;20;...;96

Số các số hạng:

(96-12):4+1=22 số

Tổng các số hạng:

(12+96)x22:2=1188

Trung bình cộng là:

1188:22=54

Đáp/Số: 54

Answer 3

Ta có dãy số như sau: 12;16;20;...;96

Số các số hạng:

(96-12):4+1=22 số

Tổng các số hạng:

(12+96)x22:2=1188

Trung bình cộng là:

1188:22=54

Đáp/Số: 54

Answer 4

CÁC SỐ CHIA HẾT CHO 4 LẬP THÀNH 1 DÃY SỐ CÁCH ĐỀU NHAU 4 ĐƠN VỊ CÓ SỐ ĐẦU LÀ 12,SỐ CUỐI LÀ 96

SỐ CÁC SỐ HẠNG LÀ:(96-12):4+1=22(SỐ)

TỔNG CÁC SỐ LÀ:(96+12)x22:2=1188

TRUNG BÌNH CỘNG CÁC SỐ LÀ:1188:22=54

                           Đ/S:54

NHỚ K CHO MÌNH NHÉ

Answer 5

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Answer 6

Đ/S:54

Answer 7

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Answer 8

Ta có dãy số: 12,16,20,....96

Số số hạng trong dãy là: (96-12):4+1=22 số

Tổng các số hạng là: (12+96)×22:2=1188

Trung bình cộng là: 1188:22=54

Answer 9

ta có dãy số đó như sau

12,16,20,.....,96

trung bình cộng của tất cả các số chia hết cho 4 là

(12+96):2=54

 đ/s: 54