5.2乘以2.3+5.9乘以2.3-33?
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5.2×2.3+5.9×2.3-33
=2.3×(5.2+5.9)-33
=2.3×11.1-33
=2.3×10+2.3×1+2.3×0.1-33
=23+2.3+0.23-33
=-(33-25.53)
=-7.47
=2.3×(5.2+5.9)-33
=2.3×11.1-33
=2.3×10+2.3×1+2.3×0.1-33
=23+2.3+0.23-33
=-(33-25.53)
=-7.47
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