a) Tính nhẩm:
18 : 9 36 : 9 9 : 9 | 45 : 9 27 : 9 90 : 9 | 54 : 9 81 : 9 63 : 9 |
b) Tính:
9dm:9
90kg:9
63l :9
Số lớn nhất trong các số 459 495; 459 549; 549 954 và 549 945 là:
A.459 495
B.459 549
C.549 954
D.549 945
Số lớn nhất trong các số 459 495; 459 549; 549 954 và 549 945 là 549 954.
Chọn C.
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1 . tính giá trị biểu thức
a.5 + 10 + 15+..........+100+ 105
b. 999 +990 +981+ ...............+ 18 + 9
Ai có câu trả lời nhanh nhất trong ngày hôm nay mk tick và kb cùng đó nhe !
a) số số hạng dãy đó là :
( 105 - 5 ) : 5 + 1 = 21 ( số )
tổng dãy đó là :
( 105 + 5 ) . 21 : 2 = 1155
b) số số hạng dãy đó là :
( 999 - 9 ) : 9 + 1 = 111 ( số )
tổng dãy số là :
( 999 + 9 ) . 111 : 2 = 55944
Đáp số : ...
a) Số số hạng của dãy trên là :
(105 - 5) : 5 + 1 = 21 (số)
TỔng của dãy số trên là :
(105 + 5) x 21 : 2 = 115
Đáp số ; 115
b) Tương tự nhưng cách nhau 9 đơn vị nha bạn
Bài 1 :
A ) 5 + 10 + 15 + ........ + 100 + 105
Dãy số trên có số lượng số hạng là :
( 105 - 5 ) : 5 + 1 = 21 ( số)
Tổng dãy số trên là:
( 105 + 5 ) x 21 : 2 = 1155
Vậy : 5 + 10 + 15 + ........ + 100 + 105 = 1155
B ) 999 + 990 + 981 + ......... + 18 + 9
Dãy số trên có số lượng số hạng là:
( 999 - 9 ) : 9 + 1 = 111 ( số )
Tổng dãy số trên là:
( 999 + 9 ) x 111 : 2 = 55944
Vậy: 999 + 990 + 981 + ......... + 18 + 9 = 55944
Nếu mình đúng thì các bạn k mình nhé
Tính:
4 × 5 20 : 4 20 : 5 | 4 × 6 24 : 4 24 : 6 | 4 × 9 36 : 4 36 : 9 |
b)
12 kg : 4
28 mm : 4
40 : 4
a)
4 × 5 = 20 20 : 4 = 5 20 : 5 = 4 | 4 × 6 = 24 24 : 4 = 6 24 : 6 = 4 | 4 × 9 = 46 36 : 4 = 9 36 : 9 = 4 |
b)
12 kg : 4 = 3 kg
28 mm : 4 = 7 mm
40 l : 4 = 10 l
Tính nhẩm:
2 x 6 6 x 2 12 : 2 12 : 6 | 7 x 4 4 x 7 28 : 7 28 : 4 | 9 x 3 3 x 9 27 : 9 27 : 3 | 8 x 5 5 x 8 40 : 8 40 : 5 |
2 × 6 = 12 6 × 2 = 12 12 : 2 = 6 12 : 6 = 2 | 7 × 4 = 28 4 × 7 = 28 28 : 7 = 4 28 : 4 = 7 | 9 × 3 = 27 3 × 9 = 27 27 : 9 = 3 27 : 3 = 9 | 8 × 5 = 40 5 × 8 = 40 40 : 8 = 5 40 : 5 = 8 |
Tính nhẩm: 18 : 9 =
Tính nhẩm: 18 : 9 =
Nhẩm xem kết quả phép tính nào dưới đây là đúng:
(A) 11 . 12 = 122.
(B) 13 . 99 = 1170.
(C) 14 . 99 = 1386.
(D) 45 . 9 = 415.
14 . 99 = 1386.
Đáp án: C
Tính nhẩm:
a) 66 - 60 = 98 - 90 = 72 - 70 =
78 - 50 = 59 - 30 = 43 - 20 =
b) 58 - 4 = 67 - 7 = 99 - 1 =
58 - 8 = 67 - 5 = 99 - 9 =
a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
Tính nhẩm:
18 : 9 =
27 : 9 =
36 : 9 =
45 : 9 =
18 : 2 =
27 : 3 =
36 : 4 =
45 : 5 =
18 : 9 = 2
27 : 9 = 3
36 : 9 = 4
45 : 9 = 5
18 : 2 = 9
27 : 3 = 9
36 : 4 = 9
45 : 5 = 9