(1+2.3+3.4)*(2.3+3.4+4.5)-(1+2.3+3.4+4.5)*(2.3+3.4)如何简便运算
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(1+2.3+3.4)*(2.3+3.4+4.5)-(1+2.3+3.4+4.5)*(2.3+3.4)如何简便运算答案:(1+2.3+3.4)*(2.3+3.4+4.5)-(1+2.3+3.4+4.5)*(2.3+3.4)=(1+2.3+3.4)×(2.3+3.4+4.5-2.3-3.4)=(1+2.3+3.4)×4.5=6.7×4.5以上供您参考
咨询记录 · 回答于2022-12-26
(1+2.3+3.4)*(2.3+3.4+4.5)-(1+2.3+3.4+4.5)*(2.3+3.4)如何简便运算
(1+2.3+3.4)*(2.3+3.4+4.5)-(1+2.3+3.4+4.5)*(2.3+3.4)如何简便运算答案:(1+2.3+3.4)*(2.3+3.4+4.5)-(1+2.3+3.4+4.5)*(2.3+3.4)=(1+2.3+3.4)×(2.3+3.4+4.5-2.3-3.4)=(1+2.3+3.4)×4.5=6.7×4.5以上供您参考
答案:6.7×4.5=30.15本题用到了乘法对加法的分配律的逆应用。找到公共部分,成为因数,剩下的部分相加减。以上供您参考