计算题①(18-14÷4×14)÷12；②求未知数：23x+12x-23=0.5；③8.6×8.6+8.6×25+8.6；④113-712+920-1130+1342-1556．-数学
| 1 |
| 64 |
=
| 7 |
| 64 |
=
| 7 |
| 32 |
②
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 7 |
| 6 |
| 2 |
| 3 |
| 1 |
| 2 |
| 7 |
| 6 |
| 7 |
| 6 |
x=1．
③8.6×8.6+8.6×
| 2 |
| 5 |
=（8.6+
| 2 |
| 5 |
=10×8.6，
=86．
④1
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| 3 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
=1+
| 1 |
| 3 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
