有理数乘法,7道1.25x(-1 /1/7)x(-3.2)x(-7/8) (-12)x(-1 1/7)x(-3.2)x(-7/8)(-2)x(-7)x(+5)x(-3/7) 5/31x(-2/9)x(-2 1/15)x(-4 1/2)(-10)x(3/10-1/2+1/5-0.01)(-1/2+1/6-3/8+5/12)x(-24)9 16/17x(

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