脫式計算

2021-03-19 18:34:46 字數 964 閱讀 5733

1樓:鳳凰涅槃丶吡

(dao1)360÷6-35,

回=60-35,

=25;

(2)15+19×4,

=15+76,

=91;

(3)69+300÷3,

=69+100,

=169;

(4)40×5+20,

=200+20,

=220;

(5)(答20+40)÷6,

=60÷6,

=10;

(6)(90-10)÷8,

=80÷8,

=10;

(7)200-90÷9,

=200-10,

=190;

(8)90-80÷2,

=90-40,

=50;

(9)65-90÷3,

=65-30,

=35.

1/4×(4.85÷5/18-3.6+6.15×3又3/5)+[5.5-1.75×(1又2/3+19/21)]

2樓:匿名使用者

答案是9-1=8 我用計算器算的 沒有過程 抱歉

3樓:山竹口花奈

1/4*(4.85÷5/18-3.6+6.15*3又3/5)+[5.5-1.75*(1又2/3+19/21)]

= 1/4×[(4.85×18/5+6.15×18/5)-3.6]+[5.5-1.75×(5/3+19/21)]

= 1/4×[(4.85+6.15)×18/5-3.6]+[5.5-1.75×(35/21+19/21)]

= 1/4×[11×18/5-3.6]+[5.5-7/4×54/21]

= 1/4×[39.6-3.6]+[5.5-4.5]

= 1/4×36+1

=9+1

=10求肯定!!!!!!!!!!!!!!!!!!!!!!!!

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