Các câu hỏi tương tự
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37=
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=?
Tính
| 13 + 2 – 1 = … | 15 + 3 – 2 = … |
| 14 – 1 + 3 = … | 17 – 4 + 5 = … |
| 19 – 5 – 1 = … | 18 – 2 – 2 = … |
nếu
1+1=2
2+2=8
3+3=18
vậy 4+4=?
Tính nhẩm:
15 + 1 = 10 + 2 = 14 + 3 = 13 + 5 =
18 + 1 = 12 + 0 = 13 + 4 = 15 + 3 =
Bài 13: Dấu <, =, >
10 … 10 + 3
11 + 2…. 2 + 11
9 … 10 + 9
10 … 10 + 0
17 – 4 … 14 - 3
18 – 4 … 12
15 … 15 – 1
17 + 1… 17 + 2
12+ 5 … 16
16 … 19 - 3
15 – 4 … 10 + 1
19 – 3 … 11
Tính:
| 12 + 3 – 2 = … | 18 – 4 – 1 = … | 15 – 5 + 7 = … |
36-18+18
a)
2/11+ x/x =4/7
b) 18/27- x/x =1/2
c3/18+ x/x =3/4