二年级数学思维题:怎么筒便怎么计算57 78 43=怎么做？ 78x57-78+78x43= ？用简便方法计算
57\u00d733+45\u00d757+78\u00d743\u6700\u7b80\u4fbf\u7684\u8ba1\u7b97\u65b9\u6cd557\u00d733\uff0b45\u00d757\uff0b78\u00d743\u89c2\u5bdf\u53ef\u77e5\u905357\u00d733\uff0b45\u00d757=57\u00d7\uff0833\uff0b57\uff09=57\u00d778\uff0c
\u800c57\u00d778\uff0b78\u00d743=78\u00d7\uff0857\uff0b43\uff09=78\u00d7100=7800.\u7efc\u4e0a\u53ef\u5f97\u89e3\u6cd5\u5982\u4e0b
57\u00d733\uff0b45\u00d757\uff0b78\u00d743
=57\u00d7\uff0833\uff0b57\uff09\uff0b78\u00d743
=57\u00d778\uff0b78\u00d743
=78\u00d7\uff0857\uff0b43\uff09
=78\u00d7100
=7800
\u539f\u5f0f=78\u00d7(57-1+43)
=78\u00d7(100-1)
=7800-78
=7722
57+78+43=178
57 +78+ 43
=（57+43）+78
=100+78
=178
57+78+43
＝57+43+78
＝100+78
＝178
57+43+78
=100+78
=178
绛旓細57+78+43=178
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绛旓細57 +78+ 43 =锛57+43锛+78 =100+78 =178
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