用简便方法计算 8.33-2.43-4.57 49×102-2×49 101×92 4800÷25÷4.
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(1)8.33-2.43-4.57,
=8.33-(2.43+4.57),
=8.33-7,
=1.33;
(2)49×102-2×49,
=49×(102-2),
=49×100,
=4900;
(3)101×92,
=(100+1)×92,
=100×92+1×92,
=9200+92,
=9292;
(4)4800÷25÷4,
=4800÷(25×4),
=4800÷100,
=48.
=8.33-(2.43+4.57),
=8.33-7,
=1.33;
(2)49×102-2×49,
=49×(102-2),
=49×100,
=4900;
(3)101×92,
=(100+1)×92,
=100×92+1×92,
=9200+92,
=9292;
(4)4800÷25÷4,
=4800÷(25×4),
=4800÷100,
=48.
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