6.5×0.45+0.69×4.2+0.069×13
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6.5×0.45+0.69×4.2+0.069×13=6.5×0.45+0.69×4.2+0.69×1.3=6.5×0.45+0.69×(4.2+1.3）=(5.5+1)×0.45+0.69×5.5=5.5×0.45+0.45+0.69×5.5=5.5×（0.45+0.69）+0.45=5.5×1.14+0.45=6.27+0.45=6.72
咨询记录 · 回答于2022-11-29
6.5×0.45+0.69×4.2+0.069×13
6.5×0.45+0.69×4.2+0.069×13=6.5×0.45+0.69×4.2+0.69×1.3=6.5×0.45+0.69×(4.2+1.3）=6.5×0.45+0.69×5.5=2.925+3.795=6.72
6.5×0.45+0.69×4.2+0.069×13=6.5×0.45+0.69×4.2+0.69×1.3=6.5×0.45+0.69×(4.2+1.3）=(5.5+1)×0.45+0.69×5.5=5.5×0.45+0.45+0.69×5.5=5.5×（0.45+0.69）+0.45=5.5×1.14+0.45=6.27+0.45=6.72
6.5×0.45+0.65×4.2+0.065×13
下面 是简便计算哦 亲亲
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谢谢
6.5×0.45+0.65×4.2+0.065×13
6.5×0.45+0.65×4.2+0.065×13=6.5×0.45+6.5×0.42+6.5×0.13=6.5××(0.45+0.42+0.13）=6.5×1=65
6.5×0.45+0.65×4.2+0.065×13=6.5×0.45+6.5×0.42+6.5×0.13=6.5×(0.45+0.42+0.13）=6.5×1=65
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