1、(-5.45)×9.6-5.45×0.4=-5.45x(9.6+0.4)=-5.45x10=-54.5
2、3.9×(-5/12)+18.3×5/12=5/12x(-3.9+18.3)=5/12x14.4=5/12x72/5=72/12=6
3、517.8×(-243.2)+5178×4.32= 517.8×(-243.2)+517.8×10x4.32= 517.8x(-243.2+43.2)
= 517.8x(-200)= -103560
4、(-3³+87)×(-4又1/3+2+7/3)=(-3³+87)×(-13/3+6/3+7/3)=(-3³+87)x0=0
5、-2④-1/4×[2-(-2²)] =-16-1/4×[2-(-4)] =-16-1/4×6=-16-1.5=-17.5 注:2④是2的4次方吧?
6、1/3²+[(-3)³-(-3)]×5/3=1/9+(-27+3)x5/3=1/9+(-24)x5/3=1/9-40=-39又8/9
7、[-1-(-1/4)²]÷[1+(-1/4)²]×[(-2)³-(-3)²]²=(-1-1/16)÷(1+1/16)×(-8-9)²=-(1+1/16)÷(1+1/16)×(-17)²
=-1x289=-289
8、-3²-|-5²|×(-2/5)³-18÷|-(-3)²|=-9-5²x(-2³/5³)-18÷(-9)=-9+2³/5+2=-9+1.6+2=-5.4
9、(7.25+1又1/8+2又3/4+8又7/8)÷(3又7/2×10/13)=(30/4+9/8+11/4+71/8)÷(13/2×10/13)
=(60/8+9/8+22/8+71/8)÷5=162/8÷5=81/20=4又1/20
10、[-(-2)²+(-3)²×(-4)+7²]×(-2/3)²=[-4+9x(-4)+49]x4/9=(-4-36+49)x4/9=9x4/9=4
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