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