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
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. 37.78-19.59+41.32-30.41=37.78+41.32-(19.59+30.41)=79.1-50=29.1 `2/1.25-1.25/2=(2×2-1.25×1.25)/(2×1.25) =4/2.5-1.25×1.25/(5×0.5) =1.6-0.5×1.25 =1.6-0.625 =0.975 ≈0.98.
3.4*6.5/6.5*3.4(3.4在除号里面还是外面？) 里面的话=1 外面的话=3.4^2=11.56 5.7*5.7+5.7*7.5-5.7*3.2= 5.7*5.7+5.7*(7.5-3.2)=5.7*5.7+5.7*4.3=5.7*(5.7+4.3)=5.70 37.78-19.59+41.32-30.41= 37.78+41.32-(19.59+30.41)= 79.1-40=39.10 2/1.25-1.25/2= (2*2-1.25^2)/1.25*2= (2*2-1.25^2)/2.5= 4/2.5-1.25^2/2.5= 1.6-0.5*1.25=1.6-0.625=0.975=0.98
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