小数的简便运算3.21×8.2+87×0.18+0.82×54.9==……321.321÷321×3.21===……

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小数的简便运算3.21×8.2+87×0.18+0.82×54.9==……321.321÷321×3.21===……
小数的简便运算
3.21×8.2+87×0.18+0.82×54.9
=
=
……
321.321÷321×3.21
=
=
=
……

小数的简便运算3.21×8.2+87×0.18+0.82×54.9==……321.321÷321×3.21===……
3.21×8.2+87×0.18+0.82×54.9
=3.21×8.2+8.2×5.49+87×0.18
=8.2×(3.21+5.49)+8.7×1.8
=8.2×8.7+8.7×1.8
=8.7×(8.2+1.8)
=8.7×10
=87
321.321÷321×3.21
=321.321×3.21÷321
=321.321×0.01
=3.21321