三点25×2点8-1点8×3点五二简便运算怎么做?
2个回答
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3.25×2.8-1.8×3.52
=3.25×2.8-1.8×(3.25+0.27)
=3.25×(2.8-1.8)-1.8×0.27
=3.25×1-2×0.27+0.2×0.27
=3.25-0.54+0.054
=2.71+0.054
=2.764
=3.25×2.8-1.8×(3.25+0.27)
=3.25×(2.8-1.8)-1.8×0.27
=3.25×1-2×0.27+0.2×0.27
=3.25-0.54+0.054
=2.71+0.054
=2.764
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