(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+5.61+6.6）×（2.17+5.6）
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(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+5.61+6.6）×（2
(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+5.61+6.6）×（2.17+5.6）
(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+
(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+5.61+6.6）×（2.17+5.6）
(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+5.61+6.6）×（2.17+5.6）
令3.15+2.17+5.61=x
令2.17+5.61=y
所以原式变成
x(y+6.6)-(x+6.6)y
=xy+6.6x-xy-6.6y
=6.6(x-y)
=6.6×[(3.15+2.17+5.61)-(2.17+5.61)]
=6.6×3.15
=20.79
(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+(3.15+2.17+5.61）×(2.17+5.61+6.6)-（3.15+2.17+5.61+6.6）×（2.17+5.6）
（3.15+2.17+5.61）*（2.17+5.61+6.6）—（3.15+2.17+5.61+6.6）*（2.17+5.61）
标赔初盘:2.85|3.15|2.
简便方法计算题：（2.17+5.49+3.81）*（5.49+2.17+9.2）-（3.81+2.17+5.49+9.2）*（（2.17+5.49+3.81）*（5.49+2.17+9.2）-（3.81+2.17+5.49+9.2）*（2.17+5.49）
3.15
（2+3.15+5.87）*（3.15+5.87+7.32）-（2+3.15+5.87+7.32）*（3.15+5.87）简便算法（分数）
简便计算 （2+3.15+5.87)×(3.15+5.87+7.32）-（2+3.15+5.78+7.32）×（3.15+5.87）
（2+3.15+5.87)X(3.15+5.87+7.32)—（2+3.15+5.87+7.32）X（3.15+5.87）要简便
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