用简便方法计算下面各题.143+69+357+431 36×98+36×2 125×88 2300÷25÷4 103×12 234×15-15
用简便方法计算下面各题.143+69+357+43136×98+36×2125×882300÷25÷4103×12234×15-15×134....
用简便方法计算下面各题.143+69+357+431 36×98+36×2 125×88 2300÷25÷4 103×12 234×15-15×134.
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(1)143+69+357+431,
=(143+357)+(69+431),
=500+500,
=1000;
(2)36×98+36×2,
=36×(98+2),
=36×100,
=3600;
(3)125×88,
=125×8×11,
=1000×11,
=11000;
(4)2300÷25÷4,
=2300÷(25×4),
=2300÷100,
=23;
(5)103×12,
=(100+3)×12,
=1200+36,
=1236;
(6)234×15-15×134,
=(234-134)×15,
=100×15,
=1500.
=(143+357)+(69+431),
=500+500,
=1000;
(2)36×98+36×2,
=36×(98+2),
=36×100,
=3600;
(3)125×88,
=125×8×11,
=1000×11,
=11000;
(4)2300÷25÷4,
=2300÷(25×4),
=2300÷100,
=23;
(5)103×12,
=(100+3)×12,
=1200+36,
=1236;
(6)234×15-15×134,
=(234-134)×15,
=100×15,
=1500.
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