来自李维祥的问题
【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回答
2020-11-07 02:01
【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=87321.321÷321×3.21=321.321×3.21÷321=321.321×0.01=3.21321
第二道的第一步:=321.321×3.21÷321其中3.21÷321可以加()么?
什么意思?