①-(+)
②6--
③-(-)
④+-+
⑤+-
⑥-(+)
3.6+0.12+0.3
4.9×7.6+7.6×0.5+4.6×7.6
0.72+(7﹣4×1.6)
4.11+[(2.5+0.24)×0.5]
-(- ) - + + + +
-(+ ) +( - ) - - -