小学数学加法计算题

=5+(-5+20)

=5+15

=20

(-30)+(-15)+(-68),

=-(30+15+68)

=-113

0+(-3.65)+(+2.75)+(-2.5),

=0-3.65+2.75-2.5

=-3.65+(2.75-2.5)

=-3.65+0.25

=-(3.65-0.25)

=-3.4

(-7和2/7)+(+2和2/3)+(+4和3/7)+(-4和1/3)，

=(4 3/7-7 2/7)+(2 2/3-4 1/3)

=(-2 6/7)+(-1 2/3)

=-(2 6/7+1 2/3)

=-4和11/28

(-三分之二)+(二分之一)+(-六分之五)+(-三分之一)，

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

=-1-1/3

=-(1+1/3)

=-1和1/3

(-四又二分之一)+{五分之三+(-0.13)+0.33}，

=-(4 1/2-3 2/5)+(0.33-0.13)

=-1和1/10+0.2

=-(1和1/10-1/5)

=-9/10

5+{+4+3+7+(4+5)+6},

=5+4+3+7+9+6

=34