25*48 =25*4*12 =100*12 =1200
16*25简便运算脱式计算的方法 =25x4x4 =100x4 =400
=25*4*46 =100*46 =4600
25x48x4=(25x4)x48=100x48=4800
48*25=(50-2)*25 =50*25-2*25=1250-50=1200
769+48+25*4=770-1+50-2+100=920-3=917
48x25=6x(8x25)=6x200=1200
36*25*4=36*(25*4)=36*100=3600
25*42*4 68*125*8 4*39*25 4*25+16*25 4*25*16*25 36*99 (25+15) *4 (25*15)*4 49*49+49*51 49*99+49 (68+32)*5 5*289*2 68+32*5 (125*25)*4 (125 + 17)*8 25*64*125 85*82 + 82*15 25*97 + 25*3 64*15-14*15 125*88 88*102 87*99
=128*(25*4)=128*100=12800