6.5*0.21

来源：学生作业帮助网编辑：作业帮时间：2024/11/28 01:16:50

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6.5*0.21
6.5*0.21

6.5*0.21
=6.5*(0.2+0.01)
=6.5*0.2+6.5*0.01
=1.3+0.065
=1.365

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6.5*0.21=1.365

=6.5*(0.2+0.01)
=6.5*0.2+6.5*0.01
=1.3+0.065
=1.365

6.5*0.21 简便方法：2.71×6.5+0.21×27.1+2.71 6.5g不纯的锌与足量的稀硫酸反应,产生0.21g氢气,所含杂质不可能是 Mg Fe Al Cu具体讲解 6.5g不纯的锌与足量稀硫酸反应生成氢气0.21g,可能含铁铜镁铝,不正确的是:1肯定含Mg 2肯定同时含镁铝铁3可能含镁铝4可能同时含铁铜镁铝 (1+0.21+0.32)*(0.21+0.32+0.43)-(1+0.21+0.32+0.43)*(0.21+0.32)要怎么简算, 计算(1+0.21+0.32)x(0.21+0.32+0.43)-(1+0.21+0.32+0.43)x(0.21+0.2) 计算(1+0.21+0.32)x(0.21+0.32+0.43)-(1+0.21+0.32+0.43)x(0.21+0.2) 2.5*0.4+0.21*3 (1+0.228-0.21)*(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)*(0.228-0.21)巧算?写清思路 (1+0.228-0.21)*(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)*(0.228-0.21)要求简便运算（1＋0.228-0.21）x(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)x(0.228-0.21) 巧算0.39×0.21 0.21:0.49化简（1+0.21+0.32）*（0.21+0.32+0.43）-（1+0.21+0.32+0.43）*（0.21+0.32） 0.21=( ) 写成分数 0.21等于几分之几 0.21等于几分之几 0.21升等于多少毫升?