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第112頁(yè)

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乘法分配律
=1.25×5.4+6.7×1.25-1.25×4.1
=1.25×(5.4+6.7-4.1)
=1.25×8
=10
=7.4×6.8+6.8×4.6-6.8×2
=6.8×(7.4+4.6-2)
=6.8×10
=68
乘法分配律
2
=0.333×2×0.24+0.333×0.52
=0.333×(0.48+0.52)
=0.333×1
=0.333
1.59
=0.44×2×2.1+0.44×2.6-0.44×1.8
=0.44×(4.2+2.6-1.8)
=0.44×5
=2.2
0.38
1.21
   12.5×0.54+0.067×125-1.25×4.1
=1.25×5.4+6.7×1.25-1.25×4.1
=1.25×(5.4+6.7-4.1)
=1.25×8
=10
  0.666×0.24+0.333×0.52
=0.333×0.48+0.333×0.52
=0.333×(0.48+0.52)
=0.333×1
=0.333
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