25x16x25x84=?78+22x7=?39x102=?104x25=?{25x13}x4=?
4个回答

25x16x25x84=25x4x(25x4)x84=100x100x84=840000

78+22x7=78+(20+2)x7=78+20x7+2x7=78+140+14=232

39x102=39x(100+2)=39x100+39x2=3900+78=3978

104x25=(100+4)x25=100x25+4x25=2500+100=2600

{25x13}x4==25x13x4=25x4X13=100X13=1300