题目内容
脱式计算.
355×4-809
8×(507-259)
156×9÷4.
355×4-809
8×(507-259)
156×9÷4.
(1)355×4-809,
=1420-809,
=611;
(2)8×(507-259),
=8×248,
=1984;
(3)156×9÷4,
=156÷4×9,
=36×9,
=324.
=1420-809,
=611;
(2)8×(507-259),
=8×248,
=1984;
(3)156×9÷4,
=156÷4×9,
=36×9,
=324.
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