Question

(2.15＋5.17＋3.62)x（5.17＋2.15＋8.5）－（3.62＋2.15＋8.5＋5

(2.15＋5.17＋3.62)x（5.17＋2.15＋8.5）－（3.62＋2.15＋8.5＋5.17）x(2.15＋5.17)＝

Answer 1

设a=2.15＋5.17
b=5.17＋2.15＋8.5
(2.15＋5.17＋3.62)x（5.17＋2.15＋8.5）－（3.62＋2.15＋8.5＋5.17）x(2.15＋5.17)

=(a+3.62)b-(b+3.62)a
=ab+3.62b-ab-3.62a
=3.62b-3.62a
=3.62(b-a)
=3.62×8.5
=30.77

Answer 2

30.77
解：
令a=2.15，b=5.17，c=3.62，d=8.5
则原式=
(a＋b＋c) x（b + a＋d）－(a + b＋c + d）×( a + b )
= ( a + b )²+ (a + b＋c + d）×( a + b )+c d- ( a + b )²- (a + b＋c + d）
=c d
=3.62×8.5
=30.77

追答

纠正:
= ( a + b )²+ (a + b)×(c + d）×( a + b )+c d- ( a + b )²- (a + b)×(c + d）
=c d
=3.62×8.5
=30.77

Answer 3

30.77
望采纳

Answer 4

30.77