简便算法 250×60 630÷35÷2 125×16 800÷32 25×36 810÷54 22×6×5 55×14.
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(1)250×60,
=(250×4)×(60÷4),
=1000×15,
=15000;
(2)630÷35÷2,
=630÷(35×2),
=630÷70,
=9;
(3)125×16,
=125×8×2,
=1000×2,
=2000;
(4)800÷32,
=(800÷8)÷(32÷8),
=100÷4,
=25;
(5)25×36,
=25×4×9,
=100×9,
=900;
(6)810÷54,
=(810÷9)÷(54÷9),
=90÷6,
=15;
(7)22×6×5,
=22×5×6,
=110×6,
=660;
(8)55×14,
=55×2×7,
=110×7,
=770.
=(250×4)×(60÷4),
=1000×15,
=15000;
(2)630÷35÷2,
=630÷(35×2),
=630÷70,
=9;
(3)125×16,
=125×8×2,
=1000×2,
=2000;
(4)800÷32,
=(800÷8)÷(32÷8),
=100÷4,
=25;
(5)25×36,
=25×4×9,
=100×9,
=900;
(6)810÷54,
=(810÷9)÷(54÷9),
=90÷6,
=15;
(7)22×6×5,
=22×5×6,
=110×6,
=660;
(8)55×14,
=55×2×7,
=110×7,
=770.
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