简便计算 4×0.27×253.8×99+3.8(8+49)÷497-45-15.
除法
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(1)4×0.27×25,
=(4×25)×0.27,
=100×0.27,
=27;(2)3.8×99+3.8,
=3.8×(99+1),
=3.8×100,
=380;(3)(8+49)÷4,
=(8+49)×14,
=8×14+49×14,
=2+19,
=219;(4)97-45-15,
=97-(45+15),
=97-1,
=27.
