21.5乘以1.9加2.15乘以81 简便运算
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21.5乘以1.9加2.15乘以81简便运算21.5乘以1.9加2.15乘以81简便运算21.5乘以1.9加2.15乘以81简便运算21.5乘以1.9加2.15乘以81=21.5×1.9+2.15×8
21.5乘以1.9加2.15乘以81 简便运算
21.5乘以1.9加2.15乘以81 简便运算
21.5乘以1.9加2.15乘以81 简便运算
21.5乘以1.9加2.15乘以81
=21.5×1.9+2.15×81
=2.15×(19+81)
=2.15×100
=215;
21.5*1.9+2.15*81
=21.5*1.9+21.5*8.1
21.5*(1.9+8.1)
=21.5*10
=215望采纳
都写成分式然后提公因式20分子43
=21.5×1.9+2.15×81
=2.15×(19+81)
=2.15×100
=215
计算器
21.5乘以1.9加2.15乘以81 简便运算
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