把下列各式写成省略加号的代数和的形式,再作计算(注意算式中那些数前的加号已被省略了)(1)10-(-18)+(-7)-5 (2)-40+32-(-4)-(-1) (3)-5-(-4)-7+(-9)+6+(-1)(4)(-3 1/2)+(-2 1/4)-1 1/2-(-4 1/4)
2019-05-07
把下列各式写成省略加号的代数和的形式,再作计算(注意算式中那些数前的加号已被省略了)
(1)10-(-18)+(-7)-5 (2)-40+32-(-4)-(-1) (3)-5-(-4)-7+(-9)+6+(-1)
(4)(-3 1/2)+(-2 1/4)-1 1/2-(-4 1/4)
优质解答
(1)原式=10-(-18)-7-5
= 10+18-7-5
=16
(2)原式=-40-(-20)-(-4)-(-1)
=-40+20+4+1
=-15
(3)原式=-5-(-4)-7-9-(-6)-1
=-5+4-7-9+6-1
=-12
(3)原式=(-3 1/2)-(2 1/4)-1 1/2-(-4 1/4)
=-4 1/2+2 1/4
=0
(1)原式=10-(-18)-7-5
= 10+18-7-5
=16
(2)原式=-40-(-20)-(-4)-(-1)
=-40+20+4+1
=-15
(3)原式=-5-(-4)-7-9-(-6)-1
=-5+4-7-9+6-1
=-12
(3)原式=(-3 1/2)-(2 1/4)-1 1/2-(-4 1/4)
=-4 1/2+2 1/4
=0