2/3y+2=-1/6y+4怎么算?
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2/3y+2=-1/6y+4怎么算?
2/3y+2=-1/6y+4怎么算?
2/3y+2=-1/6y+4怎么算?
2/3y+2=-1/6y+4
4y+12=-y+24
5y=12
y=12/5
2/3y+1/6y=2 5/6y=2 y=12/5
1.-2a
2.C
3.-2
4.原式=1/2*(1/1-1/3+1/3-1/5···+1/2007-1/2009)=1004/2009
5.原式=(99*49+48)/49*(-7)=-(100*49-1)/7=-700-1/7=699又6/7
6.原式=-7y+2y-3-6y-4=-11y-7
7.D
8.原式=-2009-(-2010)...
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1.-2a
2.C
3.-2
4.原式=1/2*(1/1-1/3+1/3-1/5···+1/2007-1/2009)=1004/2009
5.原式=(99*49+48)/49*(-7)=-(100*49-1)/7=-700-1/7=699又6/7
6.原式=-7y+2y-3-6y-4=-11y-7
7.D
8.原式=-2009-(-2010)=1
9.原式=(-81/8)*7/9*7/9*(-1/2)=(81*7*7*1)/(8*9*9*2)=49/16
10.原式=3.3/(-10/3)=(33/10)*(-3/10)=-99/100
11.原始=(-11/2)*(-1/6)*(3/5)/(-7/4)=-(11*1*3*7)/(2*6*5*4)=-77/80
12.原式=-4-[1.25+(3/4)*8] =-4-(1.25+6)=-4-1.25-6=-11.25
对了对了 还有一题
[(+1又3/4)-(-7/8)+(-7/12)]/(-7/8)
原式=(7/4+7/8-7/12)*(-8/7)=-2-1+2/3=-7/3
还有 第12题是(-4)÷[1.25+(2-1又1/4)*8]
原式=-4/(1.25+6)=-4/(29/4)=-4*4/29=-16/29
还是错了不负责~~
收起