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脱式:(0.25+0.8)-(12分之5-8分之1)=?脱式:438+240/15*0.6(8分之3+4分之1)/16分之5-0.0920-16/15分之8*4.0514分之5/21分子4*(0.16+0.32)48+240/15*7(4分之3+5分之2)*5分之4-0.72.7-16/15分之8*3.0518分之5/6分之5*(

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▼优质解答
答案和解析
(0.25+0.8)-(12分之5-8分之1)
=1/4+4/5-5/12+1/8
=3/8+48/60-25/60
=3/8+23/60
=45/120+46/120
=91/120
438+240/15*0.6
=438+16*0.6
=438+9.6
=447.6
(8分之3+4分之1)/16分之5-0.09
=(5/8)*16/5-0.09
=2-0.09
=1.91
20-16/15分之8*4.05
=20-16*15/8*4.05
=20-30*4.05
=20-121.5
=-101.5
14分之5/21分子4*(0.16+0.32)
=5/14*21/4*0.48
=3/8*0.48
=0.375*0.48
=18.27
48+240/15*7
=48+16*7
=48+112
=160
(4分之3+5分之2)*5分之4-0.7
=23/20*4/5-0.7
=23/25-7/10
=46/50-35/50
=11/50
2.7-16/15分之8*3.05
=2.7-16*15/8*3.05
=2.7-30*3.05
=2.7-91.5
=-88.8
18分之5/6分之5*(1.6+0.32)
=5/18*6/5*1.92
=(1/3)*1.92
=0.64