（3.15+2.17+5.61）（2.17+5.61+6.6）—（3.15+2.17+5.61+6.6）（2.17+5.61）

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（3.15+2.17+5.61）*（2.17+5.61+6.6）—（3.15+2.17+5.61+6.6）*（2.17+5.61）（3.15+2.17+5.61）*（2.17+5.61+6.6）—（3

（3.15+2.17+5.61）*（2.17+5.61+6.6）—（3.15+2.17+5.61+6.6）*（2.17+5.61）
（3.15+2.17+5.61）*（2.17+5.61+6.6）—（3.15+2.17+5.61+6.6）*（2.17+5.61）

（3.15+2.17+5.61）*（2.17+5.61+6.6）—（3.15+2.17+5.61+6.6）*（2.17+5.61）
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

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（3.15+2.17+5.61）*（2.17+5.61+6.6）—（3.15+2.17+5.61+6.6）*（2.17+5.61）
=（3.15+2.17+5.61）*（2.17+5.61+6.6）—（3.15+2.17+5.61）*（2.17+5.61）—6.6*（2.17+5.61）
=(3.15+2.17+5.61)(2.17+5.61+6.6-2.17-5.61)—6.6*（2.17+5.61）
=(3.15+2.17+5.61)*6.6-6.6*（2.17+5.61）
=6.6*(3.15+2.17+5.61-2.17-5.61）
=6.6*3.15
=20.79

收起

设：3.15+2.17+5.61=A
2.17+5.61=B
原式=A*（B+6.6）-（A+6.6）*B
=A*B+6.6*A-A*B-6.6*B
=6.6*（A-B）
∵A-B=（3.15+2.17+5.61）-（2.17+5.61）=3.15
∴6.6*（A-B）=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 15.73-（2.17+0.73）这道题的简算, 巧算（写过程）15.4-2.17-3.83+4.6 a÷b＝2.17,（0.5a）÷（0.5b）=（） 1.15.3.15.5.11 ）.）问括号里的是多少? 3.15,16,13,19,11,22,（）,（）,7,（ ),... 一个三位小数的近似值是2.17,这个数最大是（）,最小是（）. 3.15乘0.9=315乘9除以（） 3.15分钟等于多少小时（不要分数,要小数!） 2.17乘个小数,以知积是个四位小数,那么这个小数一定是（）位小数今天（2.17）掌阅iReader书虫大作战的答案是什么呀