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问题: =0.1×(-3%)+ 0.3×3%+ 0.4×7 %+ 0.2×10%=5.4%

=0.1×(-3%) +0.3×3%+0.4×7 %+0.2×10%=5.4%

请列出计算步骤

解答:

这也太简单了!
0.1×(-3%) +0.3×3%+0.4×7 %+0.2×10%
=3%×(-0.1+0.3)+0.4×(7%+5%)
=0.2×3%+0.2×2×12%
=0.2×(3%+24%)
=0.2×27%
=5.4%