2 + 3 + 4 - 9
= 5 + 4 - 9
= 9 - 9
= 0
mik nhah nhất nha
2 + 3 + 4 - 9
= 5 + 4 - 9
= 9 - 9
= 0
k mik nhe
2+2-4+3+3+9-1+9-5-4+9
1+2+3+4+5+6+7+8+9-1-2-3-4-5-6-7-8-9*2+1+2+3+4+5+6+7+8+9=
1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9
Tính nhanh:
a)2+4+8+6+7+8+3+9+2+1;
b)3+2+4+9+7+1+8+6+3+5;
c)2+3+4+5+6+7+8+9+1+4.
Tính nhẩm:
a. 1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9= ....?
b. 9-9+8-8+7-6+6-5+1-3+2+4+5+6-3-8=....?
9+9+9+9+9+9+9+9+9+9+9+9+9=?
1+2+3+4+5+6+7+8+9= ?
1+4+8+3+0+1+8+9+11+60= ?
Tính nhẩm:
8 + 5 = .... 8 + 7 = ....
8 + 4 = .... 8 + 2 + 3 = ....
8 + 2 + 5 = .... 8 + 2 + 2 = ....
9 + 5 = .... 9 + 7 = ....
9 + 8 = .... 9 + 1 + 4 = ....
9 + 1 + 6 = .... 9 + 1 + 7 = ....
2+9+10+3+4+1+2+3+4+5+6+7+8+9+10=may
1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9
