搜狗做题网帮忙解到数学题,小升初的.
来源：学生作业帮 编辑：搜狗做题网作业帮 分类：数学作业 时间：2024/07/18 16:48:15
帮忙解到数学题,小升初的.
（0.1²+0.2²+0.3²+0.4²）²/（0.1³+0.2³+0.3³+0.4³）³
要用最简单的方法算出,硬算得出答案是90,但是简约的方法算来都不对,麻烦各位,谢谢!
（0.1²+0.2²+0.3²+0.4²）²/（0.1³+0.2³+0.3³+0.4³）³
要用最简单的方法算出,硬算得出答案是90,但是简约的方法算来都不对,麻烦各位,谢谢!
你把小数都化成分数看看
[(1/10)²+(2/10)²+(3/10)²+(4/10)²]²÷
[(1/10)³+(2/10)³+(3/10)³+(4/10)³]³
=[(1+4+9+16)/100]²/[(1+8+27+64)/1000]³
=(3/10)²/(1/10)³
=0.3×0.3÷0.1÷0.1÷0.1
=(0.3÷0.1)×(0.3÷0.1)÷0.1
=3×3÷0.1
=90
[(1/10)²+(2/10)²+(3/10)²+(4/10)²]²÷
[(1/10)³+(2/10)³+(3/10)³+(4/10)³]³
=[(1+4+9+16)/100]²/[(1+8+27+64)/1000]³
=(3/10)²/(1/10)³
=0.3×0.3÷0.1÷0.1÷0.1
=(0.3÷0.1)×(0.3÷0.1)÷0.1
=3×3÷0.1
=90