计算: (1)-
(2)3.75-(-
(3)3
(4)(-4
(5)(-123)+3
(6)25×
(7)(-3)2÷2
(8)(-79)÷2
(9)[30-(
(10)(-1)3-(1-
(11)(
(12)-22-(1-
(13)99
(14)-36
(15)(-7)×(+5)-90÷(-15) (16)(-
|
(1)-
+51 3
-51 4
-31 4
+121 7 6 7
=-
+91 3 5 7
=9
;8 21
(2)3.75-(-
)+(-41 2
)+(-0.5)+(-62 3
)3 4
=3.75+
-41 2
-0.5-62 3 3 4
=3.75-6
+3 4
-0.5-41 2 2 3
=-3-42 3
=-7
;2 3
(3)3
+(-22 5
)+(-37 8
)+55 12
+(-13 5
)+51 8 5 12
=3
+52 5
+(-23 5
)+(-17 8
)+(-31 8
)+55 12 5 12
=9-4+2
=7;
(4)(-4
)+(-3.75)+(-25 8
)+(-33 8
)1 4
=(-4
)+(-25 8
)+(-33 8
)+(-3.75)1 4
=-7-7
=-14;
(5)(-123)+3
+(-41 3
)+(+123)+(-1 4
)+(-1 3
)3 4
=(-123)+(+123)+3
+(-1 3
)+(-41 3
)+(-1 4
)3 4
=0+3-5
=-2;
(6)25×
+(-25)×(-3 4
)1 4
=25×(
+3 4
)1 4
=25;
(7)(-3)2÷2
×(-1 4
)2+4-22×(-2 3
);1 3
=9×
×4 9
+4-4×(-4 9
)1 3
=
+4+16 9 4 3
=
;64 9
(8)(-79)÷2
+1 4
×(-29)4 9
=(-79)×
+4 9
×(-29)4 9
=(-79-29)×4 9
=-108×4 9
=-48;
(9)[30-(
+7 9
-5 6
)×36]÷(-5)11 12
=[30-(
×36+7 9
×36-5 6
×36)]÷(-5)11 12
=[30-28-30+33]÷(-5)
=5÷(-5)
=-1;
(10)(-1)3-(1-
)÷3×[3-(-3)2]1 2
=-1-
×1 2
×[3-9]1 3
=-1-
×1 2
×[3-6]1 3
=-1+1
=0;
(11)(
+1 4
-1 12
-7 18
)÷1 36
-2×(-1 36
)1 3
=(
+1 4
-1 12
-7 18
)×36+1 36 2 3
=
×36+1 4
×36-1 12
×36-7 18
×36+1 36 2 3
=9+3-14-1+2 3
=-
;7 3
(12)-22-(1-
×0.2)÷(-2)31 5
=-22-(1-
)÷(-8)1 25
=-22-
×(-24 25
)1 8
=-22+3 25
=-21
;22 25
(13)99
×(-9)17 18
=(100-
)×(-9)1 18
=100×(-9)-
×(-9)1 18
=-900+1 2
=-899
;1 2
(14)-36
÷99 11
=-36×
-1 9
×9 11 1 9
=-4
;1 11
(15)(-7)×(+5)-90÷(-15)
=-35+6
=-29;
(16)(-
)×(-18)-(+0.25)×(-6)÷(-5)2 3
=12-(-1.5)÷(-5)
=12-0.3
=11.7.