如题所述
第1个回答 2021-04-05
第一个不是+,是X吧
下面按照“X”来计算,原式=(79+22-1)X25
=(101-1)X25
=100X25
=2500
下面按照“X”来计算,原式=(79+22-1)X25
=(101-1)X25
=100X25
=2500
第2个回答 2021-04-05
应该是下面的算式
才可以逆运用乘法配律进行简算:
79×25+22×25-25
=(79+22-1)×25
=100×25
=2500
才可以逆运用乘法配律进行简算:
79×25+22×25-25
=(79+22-1)×25
=100×25
=2500
第3个回答 2021-04-05
79×25+22×25-25
=(79+22-1)×25
=100×25
=2500
=(79+22-1)×25
=100×25
=2500
第4个回答 2021-04-05
79+25+22×25-25
=80+22×25-1
=80+550-1
=630-1
=629
=80+22×25-1
=80+550-1
=630-1
=629
第5个回答 2021-04-06
根据规则,先乘除再加减
=79+25-25+22x25
=79+22x25
=79+550
=629
=79+25-25+22x25
=79+22x25
=79+550
=629