小专题(一) 有理数的混合运算及答案
计算:
(1)-7+13-6+20; (2)(-49) -90-(-6) +(-9) ;
(3)6.8-(-4.2) +(-9) ; (4)111233-6×(-611) ; (6)(13112(43-1) ×3]÷(-5) ; (8)((9)(-131213) ÷5-13÷5+13×5 (10)
-20-(-5) ×|2
5|;
-33) ×2÷(-3) ×12
-2) 4+4×(-1) 5
-(-3) ;
-3-[-5+(1-0.2×33
5) ×(-122)].
计算:
141
(1)-3+8×(--(-12) ÷6; (2)23×(-3) -(-2) ÷(-.
2(3)24×(12+13-112; (4)((5)(-5) ×1233-2×33-12÷(11; (6)(
(7)-14-16×[2-(-3) 2]; (8)
(9)-24+2×(-2) 4
+(-9) ÷(-123) ; 6434÷13×4×(-1
9) ;
-3) 2-116×56(-32
) ;
-22
-[-5+(1-235÷(-2)];
(10)(-2) ÷[(-121332) ×(2) ]×|4
参考答案
题组(一) (1)原式=20.
(2)原式=-49-90+6-9=-142. (3)原式=6.8+4.2-9=11-9=2. 2
(4)原式=-20-(-5) ×20+2=-18.
5116624
(5)原式=(-4×(=(-4) ×(-) =[1**********]
(6)原式=-66÷(-3) ×66×=11.
232
111511
(7)原式=×3) ×(-=×(-) =-12125656(8)原式=16+4×(-1) +3=16-4+3=15.
12112
(9)原式=(-131+13) ×2×33555
133325
(10)原式=-3-[-5+(1-×(-=-3-[-5+(1-) ×(-=-3-(-5-1)
55222522=3.
题组(二)
1111
(1)原式=-3+8×-(-12) 32.
16622
(2)原式=-69-128 =-197.
1019
(3)原式=24×() =24×=18.
121212
311311
(4)原式=(÷×4×(-) =(-) ×3×4×() =(-9) ×(-) =1.
[1**********]1
(5)+12×=-24+44=20.
333515920
(6)原式=9(-9) =9.
66663
1171
(7)原式=-1-(2-9) =-1-(-7) =-1=.
6666
1119
(8)原式=-4-[-5+(-) ×(-=-4-(-5+=.
521010
1
(9)原式=-16+2×16+(-9) 16+32+(-9) ×9=16-81=-65.
91133
(10)原式=(-2) ÷[×=(-2) ×3248.
4844