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2 x 3 = 6=2+2+23+35 x 4 = 20= 4+4+4+4+4 5+5+5+59 + 9 = 189 + 8 = 17 = 9 x 26 + 6 = 6 x 27+7+7+7 =7 x 49+ +3 x 9=9 9 + + +20x4= 20 20202020x3=20x3=20+20+20=602060+ 202020x3=20也就是2个十2个十x 3 = 6个十=6020x3= 603x2= 630x2= 60300x2= 6005x4= 2050x4= 200500x4=200030 x 4 =12050 x 8 =4009 x 600 =540040 x 5 =20060 x 7 =42020 x 5 =100=
