字典翻译 问答 其它 【用简便方法计算下面各题,再用字母表示出来.(1)18.7-8.8-1.2a-b-c=(2)7.4×9.9+7.4×0.1a×c+b×c=(3)8.9×2.5×4a×b×c(4)16.81+3.51+6.49a+b+c=(5)360÷1.5÷2a÷b÷c=(6)1000÷】
问题标题:
【用简便方法计算下面各题,再用字母表示出来.(1)18.7-8.8-1.2a-b-c=(2)7.4×9.9+7.4×0.1a×c+b×c=(3)8.9×2.5×4a×b×c(4)16.81+3.51+6.49a+b+c=(5)360÷1.5÷2a÷b÷c=(6)1000÷】
问题描述:

用简便方法计算下面各题,再用字母表示出来.

(1)18.7-8.8-1.2

a-b-c=

(2)7.4×9.9+7.4×0.1

a×c+b×c=

(3)8.9×2.5×4 

a×b×c

(4)16.81+3.51+6.49

a+b+c=

(5)360÷1.5÷2

a÷b÷c=

(6)1000÷(125÷1.5)

a÷(b÷c)=

郭南翔回答:
  (1)18.7-8.8-1.2   =18.7-(8.8+1.2)   =18.7-10   =8.7;   a-b-c=a-(b+c);   (2)7.4×9.9+7.4×0.1   =(9.9+0.1)×7.4   =10×7.4   =74;   a×c+b×c=(a+b)×c;   (3)8.9×2.5×4   =8.9×(2.5×4)   =8.9×10   =89;    a×b×c=a×(b×c);   (4)16.81+3.51+6.49   =16.81+(3.51+6.49)   =16.81+10   =26.81;   a+b+c=a+(b+c);   (5)360÷1.5÷2   =360÷(1.5×2)   =360÷3   =120;   a÷b÷c=a÷(b×c);   (6)1000÷(125÷1.5)   =1000÷125×1.5   =8×1.5   =12;   a÷(b÷c)=a÷b×c.
点击显示
其它推荐
热门其它推荐
  • 其它