题目内容
| 我会简算. 2478-(428+500) | 211+28+72 | 453+15+85+47 |
| 286-57-143 | 365+98 | 432-97. |
(1)2478-(428+500),
=2478-428-500,
=2050-500,
=1550;
(2)211+28+72,
=211+(28+72),
=211+100,
=311;
(3)453+15+85+47,
=(453+47)+(15+85),
=500+100,
=600;
(4)286-57-143,
=286-(57+143),
=286-200,
=86;
(5)365+98,
=365+100-2,
=463;
(6)432-97,
=432-100+3,
=335.
=2478-428-500,
=2050-500,
=1550;
(2)211+28+72,
=211+(28+72),
=211+100,
=311;
(3)453+15+85+47,
=(453+47)+(15+85),
=500+100,
=600;
(4)286-57-143,
=286-(57+143),
=286-200,
=86;
(5)365+98,
=365+100-2,
=463;
(6)432-97,
=432-100+3,
=335.
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