202.332
15.6*13.1-1.56-1.56*0.3
=1.56*(131-1-0.3)
=1.56*(130-0.3)
=1.56*129.7
=
题目有抄错吗
15.6×13.1-1.56-1.56×0.3
=1.56×131-1.56-1.56×0.3
=1.56×(131-1-0.3)
=1.56×(100+30-0.3)
=1.56×100+1.56×30-1.56×0.3
=156+46.8-0.468
=202.8-0.468
=202.332
15.6×13.1 - 1.56 - 1.56×0.3
=1.56×10×13.1 - 1.56 - 1.56×0.3
=1.56×131 - 1.56 - 1.56×0.3
=1.56×(131 - 1 - 0.3)
=1.56×129.7
=202.332
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