简算
用递等式计算。（能简算的用简便方法计算） 0.52×60.5÷6.5 1.656÷1.8×4.6 7.8×(1.309÷0.34) 7.5×(19.2÷0.24)÷1.2 2.8÷0.25 13.6÷(13.6×2)
0.52×60.5÷6.5 =0.04*13*121*0.5/0.5*13 =0.04*121 =4.84 7.8×(1.309÷0.34) =7.8*7.7*0.17/0.17*2 =3.9*7.7 =(4-1)*7.7 =4*7.7-7.7 =30.8-7.7 =23.1 2.8÷0.25 =2.8/(1/4) =2.8*4 =11.2 1.656÷1.8×4.6 =1.8*0.92/1.8*4.6 =0.92/4.6 =0.2 7.5×(19.2÷0.24)÷1.2 =7.5*(24*0.8/0.24)*1.2 =7.5*80*1.2 =(7.5+7.5*2)*80 =22.5*80 =22*80+0.5*80 =1760+40 =1800 13.6÷(13.6×2) =1/2 =0.5
问：递等式计算递等式计算(能简便则简)3.4*6.5/6.5*3.4 5.7*5.7+5.7*7.5-5.7*3.2 37.78-19.59+41.32-30.41 2/1.25-1.25/2
答：解：(3.4×6.5/6.5)×3.4=11.56 5.7×5.7+5.7×7.5-5.7×3.2=5.7×(5.7+7.5-3.2)=5.7×10=57. 3...详情>>
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