作业帮有理数(-0.125)12*813怎么算?
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有理数(-0.125)12*813怎么算?
有理数(-0.125)12*813怎么算?
有理数(-0.125)12*813怎么算?
(-0.125)12*813
=-12*(816-3)/8
=-12*816/8+36/8
=-12*102+9/2
=-12(100+2)+9/2
=-1200-24+4.5
=-1219.5
(800 + 13) * (-0.125) *12 = (800 * (-0.125)) * 12 + 13 * 12 * (-0.125)
= -100 * 12 + (12 + 1)*12 * (-0.125)
= -1200 + 12*12*(-0.125) + 12 * (-0.125)
= -1200 + 3 * 4 * 2 * 6 * (-0.125) + 12*(-0.125)
= -1200 - 18 + 12 * (-0.125) = -1218 - 3 * 4 * (0.125) = -1218 - 1.5
= -1219.5
=[（-0.125）*4](3*813)
=-0.5*2439
=-1219.5