Question

有理数的加减混合运算 -2.5+(-1/5)0.4-(-1/4)+1/61/3-(-5/6)+2/31/3+(-1/5)

Answer 1

-2.5+(-1/5)=-2.5-0.2=-2.7

0.4-(-1/4)+1/6=2/5+1/4+1/6=49/60

1/3-(-5/6)+2/3=1/3+5/6+2/3=11/6

1/3+(-1/5)+1+2/3=1-0.2+1=1.8

27-18+(-7)-32=9-7-32=-30

0.5+(-1/4)-(-2.75)+1/2=0.5-0.25+2.75+0.5=3.5

记住运算法则 负负得正,