简便计算78x25 22x25 79x25+22x25-25，用简便运算法。

79x25+22x25-25\uff0c\u7528\u7b80\u4fbf\u8fd0\u7b97\u6cd5\uff1f

79x25+22x25-25
\uff1d25\u00d7\uff0879+22-1\uff09
\uff1d25\u00d7100
\uff1d2500

\uff0879+21\uff09\u00d725
=100\u00d725
=2500
\u5982\u5e2e\u5230\u4f60\uff0c\u8bf7\u70b9\u91c7\u7eb3\uff0c\u8c22\u8c22

79x25十22x25一25 =79x25十22x25-25x1 =(79十22十1)x25 =100x25 =2500 我都发半天了

78x25
=（70+8）x25
=70x25+8x25
=175+200=375
22x25
=(20+2)x25
=20x25+2x25
=500+50
=550

78x25+ 22x25
=25x(78+22)
=25x100
=2500

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