（北京）用简便方法计算下列各题，写出计算过程．
(1)105×
+
+
(2)0.6×18﹣
×8
(3)8×2.5×1.25×4．
能简算的要简算．
| ⑴3.4×12.5×0.15×8×2 |
⑵1.25×4.6×8 |
⑶3.14×9+3.14 |
| ⑷4.5×2.6+4.5×7.4 |
⑸125×0.74×0.08 |
⑹2.86×0.5×4.6． |
列竖式计算
| ⑴4.2×0.8 |
⑵1.5×62 |
⑶2.7×0.11 |
⑷6.22×2.5 |
直接写得数．
| ⑴12.5×8= |
⑵6.4+4.6= |
⑶4.4×20= |
⑷4.18×1000= |
| ⑸6﹣0.7= |
⑹0.04×0.3= |
⑺3﹣2.01= |
⑻6.2+0.04= |
计算如图图形中∠A的度数．
计算下面各题，能简算的要简算．
⑴0.9+1.08+0.92+0.1
⑵32.54﹣10.46﹣4.54
⑶18.73+3.85﹣2.73
⑷45.6﹣（83.7﹣78.8）