4.23×7.12+42.3×0.398-0.432×11．4.23×7.12+42.3×0.398-0.432×11，
=4.23×7.12+4.23×3.98-4.32×1.1，
=4.23×（7.12+3.98-1.1），
=4.23×10，
=42.3．
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