(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)等于多少
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(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)等于多少
(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)等于多少
(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)等于多少
(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)
=(100+0.123+0.245+8.9)x(0.123+0.245+8.9）+(100+0.123+0.245+8.9)x12.71-(100+0.123+0.245+8.9)x(0.123+0.245+8.9)-12.71x(0.123+0.245+8.9)
=(100+0.123+0.245+8.9)x12.71-12.71x(0.123+0.245+8.9)
=【(100+0.123+0.245+8.9)-（0.123+0.245+8.9)】x12.71
=【100+0.123+0.245+8.9-0.123-0.245-8.9】x12.71
=100x12.71
=1271
1271
(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)
=(100+0.123+0.245+8.9)x(0.123+0.245+8.9)+(100+0.123+0.245+8.9)x12.71-(100+0.123+0.245+8.9)x(0.123+0.245+8.9)-(100+0.123+0.245+8.9)x12.71
=0
主要运用乘法分配率
(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)
=【(100+0.123+0.245+8.9)x(0.123+0.245+8.9）+(100+0.123+0.245+8.9)x12.71】— 【(100+0.123+0.2...
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主要运用乘法分配率
(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)
=【(100+0.123+0.245+8.9)x(0.123+0.245+8.9）+(100+0.123+0.245+8.9)x12.71】— 【(100+0.123+0.245+8.9)x(0.123+0.245+8.9)+12.71x(0.123+0.245+8.9)】
=(100+0.123+0.245+8.9)x12.71—12.71x(0.123+0.245+8.9)
=【(100+0.123+0.245+8.9)—（0.123+0.245+8.9)】x12.71
=【100+0.123+0.245+8.9—0.123—0.245—8.9】x12.71
=100x12.71
=1271
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=12.71x[(100+0.123+0.245+8.9)-(0.123+0.245+8.9)]
=1271