(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)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/28 21:30:32
(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)×(2.17+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