几道简便计算题 35
4/27*5/9+4*5/27+5/9*(-5/3)<(-(0.12)*(-3/4)>+<(-24)*1/12>(2*3*4*5)*(1/2+1/3+1/4+1/5)十万...
4/27*5/9+4*5/27+5/9*(-5/3)
<(-(0.12)*(-3/4)>+<(-24)*1/12>
(2*3*4*5)*(1/2+1/3+1/4+1/5)
十万火急啊,最后一天了,帮我啊~好的加分!! 要过程,谢谢 展开
<(-(0.12)*(-3/4)>+<(-24)*1/12>
(2*3*4*5)*(1/2+1/3+1/4+1/5)
十万火急啊,最后一天了,帮我啊~好的加分!! 要过程,谢谢 展开
2个回答
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4/27*5/9+4*5/27+5/9*(-5/3)
=4/27*15/27+36/9*5/27+15/27*(-15/9)
=20/243+180/243-255/243
=(20+180-255)/243
=-55/243
<(-(0.12)*(-3/4)>+<(-24)*1/12>
=(0.12*3/4)+(-24*1/12)
=0.03*3+(-2*1)
=0.09-2
=-1.91
(2*3*4*5)*(1/2+1/3+1/4+1/5)
=60*(1/2+1/3+1/4+1/5)
=60*1/2+60*1/3+60*1/4+60*1/5
=30+20+15+10
=75
=4/27*15/27+36/9*5/27+15/27*(-15/9)
=20/243+180/243-255/243
=(20+180-255)/243
=-55/243
<(-(0.12)*(-3/4)>+<(-24)*1/12>
=(0.12*3/4)+(-24*1/12)
=0.03*3+(-2*1)
=0.09-2
=-1.91
(2*3*4*5)*(1/2+1/3+1/4+1/5)
=60*(1/2+1/3+1/4+1/5)
=60*1/2+60*1/3+60*1/4+60*1/5
=30+20+15+10
=75
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