34.56-（4.56-3.7）= 6.6-2.91+3.4-1.09= 3.125+（6.875-1.72）-3.28= 4.99+4.99+4.99+0.04+4.99= 巧算
问题描述：
34.56-（4.56-3.7）= 6.6-2.91+3.4-1.09= 3.125+（6.875-1.72）-3.28= 4.99+4.99+4.99+0.04+4.99= 巧算
答
34.56-(4.56-3.7)=34.56-4.56+3.7=33.7 6.6-2.91+3.4-1.09=(6.6+3.4)-(2.91+1.09)=10-4=6 3.125+(6.875-1.72)-3.28=(3.125+6.875)-(1.72+3.28)=10-5=5 4.99+4.99+4.99+0.04+4.99=(5-0.01)×4+0.04=5×4-0.01×4+0.04...