用简便方法计算下面各题687-298  ...
用简便方法计算下面各题687-298348+(417+152)867-457-243587-378+113375+103487-(187+37)...
用简便方法计算下面各题687-298 348+(417+152) 867-457-243 587-378+113 375+103 487-(187+37)
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(1)687-298, =687-300+2, =389; (2)348+(417+152), =348+152+417, =500+417, =917; (3)867-457-243, =867-(457+243), =867-700, =167; (4)587-378+113, =587+113-378, =700-378, =322; (5)375+103, =375+100+3, =478; (6)487-(187+37), =487-187-37, =300-37, =263. |
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