(1)0.25×〔÷(4-2.4×)〕
(2)〔1-8.19÷(5.25+1)〕×÷17%
(3)6-(5-1)+1
(4)4.83×0.59+0.41×1.59-0.324×5.9
(5)5.6-(□×3-1×□)÷5=2,□=______.
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解:(1)0.25×〔÷(4-2.4×)〕,
=0.25×〔÷(4-×)〕,
=0.25×〔÷(4-2)〕,
=0.25×〔÷2〕,
=×,
=;
(2)〔1-8.19÷(5.25+1)〕×÷17%,
=〔1-8.19÷(5.25+1.75)〕×÷17%,
=〔1-8.19÷7〕×÷17%,
=〔1-1.17〕××,
=(-)××,
=××-××,
=-,
=-
=;
(3)6-(5-1)+1,
=6-5+1+1,
=6-5+1+1,
=1+1+1,
=4;
(4)4.83×0.59+0.41×1.59-0.324×5.9,
=4.83×0.59+0.41×1.59-3.24×0.59,
=(4.83-3.24)×0.59+0.41×1.59,
=1.59×0.59+0.41×1.59,
=(0.59+0.41)×1.59,
=1×1.59,
=1.59;
(5)5.6-(□×3-1×□)÷5=2,
5.6-(×□)÷5=2,
5.6-(×□)×=2,
5.6-×□=2,
×□=5.6-2.6,
□=3÷,
□=12.
故