có 2 trường hợp:
a) \(\text{30 .(x) 3 + 2 - 15 + 8}\)
\(= 90 + 2 - 15 + 8\)
\(\text{= 92 - 15 + 8}\)
\(\text{= 77 + 8 }\)
\(= 85\)
b)\(\text{ 30.(,)3 + 2 - 15 + 8}\)
\(\text{= 32,3 - 15 + 8}\)
\(\text{= 17,3 + 8}\)
\(\text{= 25,3}\)
có 2 trường hợp:
a) \(\text{30 .(x) 3 + 2 - 15 + 8}\)
\(= 90 + 2 - 15 + 8\)
\(\text{= 92 - 15 + 8}\)
\(\text{= 77 + 8 }\)
\(= 85\)
b)\(\text{ 30.(,)3 + 2 - 15 + 8}\)
\(\text{= 32,3 - 15 + 8}\)
\(\text{= 17,3 + 8}\)
\(\text{= 25,3}\)
Tính nhẩm:
14 - 1 = 15 - 4 = 17 - 2 = 15 - 3 =
15 - 1 = 19 - 8 = 16 - 2 = 15 - 2 =
15+20-30=1)...+8-9=2)...
45-8+12=3)...-49=4)...
1)...+2)...+3)...+4)...=...
Tính :
a) 12 + 3 = 15 + 4 = 8 + 2 = 14 + 3 =
15 - 3 = 19 - 4 = 10 - 2 = 17 - 3 =
b) 11 + 4 + 2 = 19 - 5 - 4 = 14 + 2 - 5 =
Điền dấu >; < ; = vào chỗ trống:
12 – 2 … 11 | 13 … 17 – 5 | 18 – 8 … 11 – 1 |
15 – 5 … 15 | 17 … 19 – 5 | 17 – 7 … 12 – 2 |
Tính:
9 + 1 = … | 15 – 4 = … | 4 + 4 = … | 25 + 2 = … |
6 – 3 = … | 11 + 7 = … | 8 – 4 = … | 48 – 6 = … |
2 + 7 = … | 10 – 2 = … | 8 – 0 = … | 54 + 3 = … |
15+9+5+8+2+1
Mật thư
OFF : A = 1
Nội dung :
4 - 15 - 15 - 19 - 4 + 2 - 1 - 14 - 10 + 22 - 9 - 20 - 10 + 14 - 1 - 15 - 6 + 4 - 9 - 4 + 2 - 1 - 14 - 7 - 23 - 6 + 8 - 1 - 9 + 3 - 8 - 1 - 14 - 1
Hết
Tính nhanh 1) 1/5+3/17-4/3+(4/5-3/17+1/15) 2) (5/8-4/13+3/2)-(5/8+9/3)
15+3=
20-8=
7-2=