87 + 25 = 112
24 + 67 = 91
43 + 78 = 121
7 x 8 = 56
9 x6 = 54
87 + 25 = 87+20+5 = 107+5 = 112
hoặc
87+25 = 87 +30 - 5 = 117 - 5 = 112
1+6+7+9+3+5+67+78+23 +87+98+34+34=bao nhiêu
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+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
57+67+98+54+65+23+87-78-87-78-87x0= ??????????????
1+2+4+5+3+5+7+5+5+52+78+85+572+78+78+78+78+78+57-2578-78-8787+587-87+578-45+278-278-86-87-37-8-8-8+78-8-+78-82+78-86
tính nhanh:a) 15/14-(17/13-87+5/4)+(17/23-15/14+1/4) b) 1/25-4/27+(-23/27+-1/25-5/43)+5/43-4/7
Viết số vào chỗ chấm cho thích hợp:
8+6=… 6+8=… 38+6=… |
8+9=… 9+8=… 78+9=… |
8+4=… 4+8=… 58+4=… |
8+7=… 7+8=… 88+7=… |
hãy tính nhanh:
A.1+2+3+4+5+6+7+8+9+10+11+12+13-14=?
B.30-29+28-27+26-25+24-23+22-21...+12-11+10-9+8-7+6-5+4-3+2-1=?
tinh nham : 3+4+9+32-67+78+9+2+65+6+9+1+5+3=......................................?
Viết kết quả vào chỗ chấm:
13 − 6 + 8 =…
7 + 5 − 9 =…
17 − 8 + 6 =…
7 + 9 − 12 =…
14 + 6 − 17 =…
51 + 18 − 40 =…
43 + 7 − 21 =…
6 + 4 − 8 =…
12 − 3 + 8 =…