脱式计算下面各题(能简算的要用简便方法计算,并写出简算过程).?
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解题思路:①先算括号里的84×27,用积减2166,最后算除;
②把5.3÷[5/11]变成5.3×2.2,再把[11/5]×3.7变成2.2×3.7,然后利用乘法的分配律计算;
③先算括号里的0.75÷3,再算括号里的减,最后算乘.
①(84×27-2166)÷17,
=(2268-2166)÷17,
=102÷17,
=6;
②[11/5]×3.7+5.3÷[5/11]+2.2,
=2.2×3.7+5.3×2.2+2.2,
=2.2×(3.7+5.3+1),
=2.2×10,
=22;
③(0.75÷3-0.1)×(1-[2/3]),
=(0.25-0.1)×[1/3],
=0.15×[1/3],
=0.05.
,5,脱式计算下面各题(能简算的要用简便方法计算,并写出简算过程).
(84×27-2166)÷17 [11/5]×3.7+5.3÷[5/11]+2.2 (0.75÷3-0.1)×(1-[2/3])
②把5.3÷[5/11]变成5.3×2.2,再把[11/5]×3.7变成2.2×3.7,然后利用乘法的分配律计算;
③先算括号里的0.75÷3,再算括号里的减,最后算乘.
①(84×27-2166)÷17,
=(2268-2166)÷17,
=102÷17,
=6;
②[11/5]×3.7+5.3÷[5/11]+2.2,
=2.2×3.7+5.3×2.2+2.2,
=2.2×(3.7+5.3+1),
=2.2×10,
=22;
③(0.75÷3-0.1)×(1-[2/3]),
=(0.25-0.1)×[1/3],
=0.15×[1/3],
=0.05.
,5,脱式计算下面各题(能简算的要用简便方法计算,并写出简算过程).
(84×27-2166)÷17 [11/5]×3.7+5.3÷[5/11]+2.2 (0.75÷3-0.1)×(1-[2/3])
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