题目内容
脱式计算
| (27+53)×7 | 560+56×2 | 28×(46-37) |
| 21+13×3 | 354-78+122 | 16×7×9. |
(1)(27+53)×7,
=80×7,
=560;
(2)560+56×2,
=560+112,
=672;
(3)28×(46-37),
=28×9,
=252;
(4)21+13×3,
=21+39,
=60;
(5)354-78+122,
=276+122,
=398;
(6)16×7×9,
=112×9,
=1008.
=80×7,
=560;
(2)560+56×2,
=560+112,
=672;
(3)28×(46-37),
=28×9,
=252;
(4)21+13×3,
=21+39,
=60;
(5)354-78+122,
=276+122,
=398;
(6)16×7×9,
=112×9,
=1008.
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