1.3.2有理数的减法1.计算(1) 3—8= (2)—4+7= (3)—6—9= (4) 8—12= (5) —15+7= (6)0—2= (7)6—9= (8) 15—21= (9)0+5= (10)（—6）—0= (11)8—8= (12) 0.4—1= (13)（—8）—8= (14) +3—2= (15)8—（—8）= (16)0-（-6）= (17)1.5—（—1.5）= (18)6—（—7）= (19) 5+（—7）= (20)（-30）-（-80）= (21) -1-2= (22) +6—3= (23) —5—9+3= (24)10-17+8=； (25)-1-2-3= (26) -9-7= (27)-5-9+3= (28) 3.6- (-6.4)= (29)+5-（+8.3）= (30) 16－23=2.计算(1) (—8)—(+2)= (2) (+27)—(+21) = (3) (—9)—(+7) = (4) (+27)-(+7) =(5) (-9)—(+9)= (6) (-27)—(+27) = (7) (-8)-(+5) = (8) = (9) = (10)(-5)-(+1) = (11)(+4)—(-7) = (12)(-3)-(-3) = (13) (+7)-(-8) = (14)(-12)-(-21) = (15)(+23)—(—24) = (16)(-9)-(-3) = (17) (+8)—(-4) = (18)(—5)—(-7) = (19) (+17)—(—11) = (20) (—3)—(—5) = 3.计算(1)（+3.41）－（－0.59）= (2) = (3) = (4) (－15)－(－27) = (5) (－4．3)－6．7 = (6)6－(－3．5) = (7) (－ )－ = (8)（–3）–（–5）= (9) (－ )－(－ )= (10)3 –（–1 ）= (11) 0–（–7）= (12) (13)－ － ＝ (14) －(－ )＝ (15) 5－5 ＝ (16) 1－ ＝(17) = （18）(—3)—(+5) = （19）(+7)—(+3) =4.计算(1)（–3）–（+5）+（–4）–（–10） (3) 1–4 + 3 |
