1+1+0+9+6+6+4674
=(1+9)+(4674+6)+0+1+6
=10+4680+1+6
=4690+1+6
=4697
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1+9*0-1+8-9+6-5=
Tính nhẩm
6 x 1 = ..... 6 x 9 = .....
6 x 2 = ..... 6 x 8 = .....
6 x 3 = ..... 6 x 7 = .....
6 x 4 = ..... 0 x 6 = .....
6 x 5 = ..... 6 x 0 = .....
6 x 6 = ..... 6 x 10 = .....
Tính nhẩm:
6 x 4 =
6 x 1 =
6 x 9 =
6 x 10 =
6 x 6 =
6 x 3 =
6 x 2 =
0 x 6 =
6 x 8 =
6 x 5 =
6 x 7 =
6 x 0 =
0+1+2+3+4+5+6+7+8+9+5+6=6
9-8+7-6+5-4+3-2+1-0-5+0-5+0-0+5-0