初中有理数加减混合运算1.计算: (1)-2.5+(-1/5) (2) 0.4-(-1/4)+1/6 (3)1/3-(-
初中有理数加减混合运算
1.计算:
(1)-2.5+(-1/5) (2) 0.4-(-1/4)+1/6
(3)1/3-(-5/6)+2/3 (4) 1/3+(-1/5)+1+2/3
(5)27-18+(-7)-32 (6)0.5+(-1/4)-(-2.75)+1/2
2.计算:
(1)33.1-(-22.9)+(-10.5) (2)(-8)-(-15)+(-9)-(-12)
(3)-2/3+(-1/6)-(-1/4)-1/2 (4)3/5-3/2+(-11/4)+13/4
虽然讲过了,可系我系不懂,请帮帮忙啦.要过程谢谢