按要求改写句子
1.This problem is too difficult for us to work out _________________________________________(用enough to 改为意思相同的句子） _________________________________________(用so.. that 改为意思相同的句子）
1.This problem is not easy enough for us to work out. 2.This problem is so difficult that we can not work out.
B1=1+9+8+6=24， B2=1+9+8+8=26, B3=1+9+9+1=20, B4=1+9+9+3=22, B5=1+9+9+5=24, B6=1+9+9+7=26, B7=1+9+9+9=28, X1=B1+B2+B3+B4+B5+B6+B7=170； B8=2+0+0+1=3, B9=2+0+0+3=5, B10=2+0+0+5=7, B11=2+0+0+7=9, B12=2+0+0+9=11, …… B43=2+0+7+1=10, B44=2+0+7+3=12, B45=2+0+7+5=14, B46=2+0+7+7=16, B47=2+0+7+9=18, B48=2+0+8+1=11, B49=2+0+8+3=13, B50=2+0+8+5=15, X2=B48+B49+B50=39。
A50=B1+B2+B3+B4+……+B50 =X1+X2+40*2+40*0+[5*(0+1+2+3+4+5+6+7)]+[8*(1+3+5+7+9)] =170+39+80+0+140+200 =629。 。
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