40个60相加的和是多少？
用简便方法计算．
简算 2.25×+1.75×+0.62.5×（1.9+1.9+1.9+1.9）
简算 4.5×25%+1.3×+2.2×0.255.02﹣1.37﹣2.63×40﹣÷．
简算： 3.61÷+6.39×0.25×32×0.15 8×+8×+8 3﹣2+5﹣1．
怎样简便怎样算． 105×（+）（2.76+3.06÷）×2.2 2.5×4.3+2.5×4.7+2.5（﹣25%+）÷×．
．
+1.75×
+2.2×0.255.02﹣1.37﹣2.63
×40﹣
÷
．
+6.39×
0.25×32×0.15 8×
+8×
+8 3
﹣2
+5
﹣1
．
+
）（2.76+3.06÷
）×2.2 2.5×4.3+2.5×4.7+2.5（
﹣25%+
）÷
×
．
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