（-3.14）x5.597+(3.14)x(-5.597)=.(-1/2+2/3-1/4)x(-24)=.9912/13x(-13)=.最后一个是99又十三分之十二,别看错了.

Question

（-3.14）x5.597+(3.14)x(-5.597)=_______.(-1/2+2/3-1/4)x(-24)=_______.99 12/13x(-13)=_______.
最后一个是99又十三分之十二,别看错了.

Answer 1

（-3.14）x5.597+(3.14)x(-5.597)
抄错了吧
(-1/2+2/3-1/4)x(-24)
=1/2x24-2/3x24+1/4x24
=12-16+6
=2
99 12/13x(-13)
=(100-1/13)x(-13)
=-100x13+1/13x13
=-1300+1
=-1299