数学计算题,(要过程)
数学计算题,(要过程)
日期:2015-09-26 15:37:58 人气:1
(1/4-1/12)×(-48)
=-1/4×48+1/12×48
=-12+4
=-8
(4/7-1/9+2/21)×63
=4/7×63-1/9×63+2/21×63
=36-7+6
=35
265×(-1.25)-12.5×13.5+0.125×3980
=265×(-1.25)-1.25×135+1.25×398
=(-265-135+398)×1.25
=-2×1.25
=-2.5