计算:9.36÷[(6-2.88)×(5-1.875)]
(2×+2×6.2-5.8×2-÷)×
(0.1++7÷1.25)÷(18.25-5×3)
(96÷4-4×5)×[(3-3.875)×49.5÷0.8÷].
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解:(1)9.36÷[(6-2.88)×(5-1.875)]
=9.36÷[3.12×(5.875-1.875)],
=9.36÷[3.12×4],
=9.36÷12.48,
=0.75;
(2)(2×+2×6.2-5.8×2-÷)×
=(×0.8+×6.2-5.8×-0.2×)×,
=(0.8+6.2-5.8-0.2)××,
=1×1,
=1;
(3)(0.1++7÷1.25)÷(18.25-5×3)
=(0.1+0.4+7.125÷1.25)÷(18.25-5.5×3.2),
=(0.5+5.7)÷(18.25-17.6),
=6.2÷0.65,
=9;
(4)(96÷4-4×5)×[(3-3.875)×49.5÷0.8÷]
=(24-20)×[(3.875-3.875)×49.5÷0.8],
=3×[0×49.5÷0.8],
=3×0,
=0.
解析分析:算式(1)(3)(4)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
算式(2)可根据乘法分配律计算.
点评:当算式中同时含有分数与小数时,要根据式中数据的特点灵活将它们互化为再进行计算.