0.37×8.7×1.8简算?
2个回答
展开全部
=0.37×(9-0.3)(2-0.2)
=0.37(9×2-9×0.2-0.3×2+0.3×0.2)
=0.37(18-1.8-0.6+0.06)
=0.37(18-2.4+0.06)
=0.37(15.6+0.06)
=0.37×15.66
=(0.4-0.03)(15+0.6+0.06)
=0.4×15+0.4×0.6+0.4×0.06-0.03×15-0.03×0.6-0.03×0.06
=6+0.24+0.024-0.45-0.018-0.0018
=6.24+0.024-0.45-0.018-0.0018
=6.24-0.45+(0.024-0.018)-0.0018
=6.24-0.24-0.21+0.006-0.0018
=6-0.21+0.0042
=5.79+0.0042
=5.7942
=0.37(9×2-9×0.2-0.3×2+0.3×0.2)
=0.37(18-1.8-0.6+0.06)
=0.37(18-2.4+0.06)
=0.37(15.6+0.06)
=0.37×15.66
=(0.4-0.03)(15+0.6+0.06)
=0.4×15+0.4×0.6+0.4×0.06-0.03×15-0.03×0.6-0.03×0.06
=6+0.24+0.024-0.45-0.018-0.0018
=6.24+0.024-0.45-0.018-0.0018
=6.24-0.45+(0.024-0.018)-0.0018
=6.24-0.24-0.21+0.006-0.0018
=6-0.21+0.0042
=5.79+0.0042
=5.7942
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