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巧算练习题1.996+19.97+199.8=_____.6.11+9.22+8.33+7.44+5.55+4.56+3.67+2.78+1.89=_____.1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19=_____2.89×4.68+4.68×6.11+4.68=_____.1.25×0.32×2.5=_____.75×4.7+15.9×25=_____.(5.25+0.125+5.75)×86.25×0.16+264×0.0625+5.2×6.25+0.625×201998+199.8+19.98+1.998(64.6+758×64.5)÷(64.6×758-11.2)a=0.00...0105b=0.00...019计算a+b,a-b,a×b,a÷b1996个01994个0