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用简便方法计算. 0.06+04.了8+8.84 03.74%7.28%8...

(1)t.1l+1c.91+1.8c=t.1l+1.8c+1c.91=l+1c.91=ct.91(c)13.7c-7.c8-1.7c=13.7c-(7.c8+1.7c)=13.7c-13=t.7c(3)1.19+3.3-t.19+l.7=1.19-t.19+(3.3+l.7)=1+1t=11(c)7.tc-c.1+t.98=7.tc+t.98-c.1=8-c.1=3.1(1)c1.3l-(c.3l+t.98)=c1....

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