1到9只用乘法符号和加号写出一个等式。

123*5+74=689,123*7+85=946,125*7+68=943,126*4+79=583,129*3+78=465

129*4+67=583,132*6+57=849,142*6+85=937,146*2+95=387,146*3+89=527

148*6+37=925,149*5+23=768,164*2+59=387,169*2+47=385,182*4+65=793

183*5+47=962,185*3+74=629,185*3+92=647,187*2+65=439,189*3+57=624

189*3+75=642,192*3+78=654,192*4+67=835,196*2+83=475,218*4+65=937

238*4+15=967,246*3+51=789,249*3+18=765,256*3+49=817,257*1+89=346

259*1+87=346,271*3+46=859,275*1+89=364,279*1+85=364,284*3+65=917

285*1+79=364,287*1+59=346,289*1+57=346,289*1+75=364,314*2+59=687

319*2+47=685,358*1+69=427,359*1+68=427,368*1+59=427,369*1+58=427

379*2+56=814,391*2+65=847,391*2+74=856,417*2+35=869,437*1+89=526

439*1+87=526,456*2+71=983,468*2+17=953,468*2+35=971,473*1+89=562

479*1+83=562,483*1+79=562,487*1+39=526,489*1+37=526,489*1+73=562

635*1+89=724,639*1+85=724,653*1+89=742,659*1+83=742,683*1+59=742

685*1+39=724,689*1+35=724,689*1+53=742,754*1+69=823,759*1+64=823

764*1+59=823,769*1+54=823

2、×+?+?=?* * *有24个(不包括乘数交换位置和加数交换位置):

12*69+4+5=837,12*74+3+5=896,12*78+3+6=945,13*49+7+8=652,14*25+8+9=367

14*26+5+9=378,14*27+5+6=389,14*56+2+3=789,14*68+2+3=957,15*28+7+9=436

15*48+3+6=729,16*24+5+8=397,16*29+3+8=475,16*37+2+4=598,17*25+6+8=439

17*34+6+8=592,17*54+6+8=932,18*27+3+6=495,18*52+3+7=946,21*35+6+8=749

23*41+6+8=957,24*37+1+6=895,25*38+4+7=961,27*36+4+5=981