计算题:(1)-5+(-15)-(-17)-|-12|(2)(+4.3)-(-4)+(-2.3)-(+4)(3)-191920×(-12)(4
计算题:(1)-5+(-15)-(-17)-|-12|(2)(+4.3)-(-4)+(-2.3)-(+4)(3)-191920×(-12)(4)(134-78-716)×...
计算题:(1)-5+(-15)-(-17)-|-12|(2)(+4.3)-(-4)+(-2.3)-(+4)(3)-191920×(-12)(4)(134-78-716)×(117) (5)3-5-4÷(-12)(6)60-1998×1567÷2×0 (7)(-5)÷(-15)×5 (8)25×34-(-25)×12+25×14.
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(1)-5+(-15)-(-17)-|-12|
=-5+(-15)+17+12
=-20+29
=9;
(2)(+4.3)-(-4)+(-2.3)-(+4)
=4.3+4+(-2.3)+(-4)
=8.3+(-6.3)
=2;
(3)-19
×(-12)
=(20-
)×12
=20×12-
×12
=240-
=239
;
(4)(1
-
-
)×(1
)
=
×
-
×
-
×
=2-1-
=
;
(5)3-5-4÷(-12)
=-2+4×
=-2×
=-
;
(6)60-1998×15
÷2×0
=60-0
=60;
(7)(-5)÷(-
)×5
=5×
×5
=5;
(8)25×
-(-25)×
+25×
=25×(
+
+
)
=25×
=
.
=-5+(-15)+17+12
=-20+29
=9;
(2)(+4.3)-(-4)+(-2.3)-(+4)
=4.3+4+(-2.3)+(-4)
=8.3+(-6.3)
=2;
(3)-19
19 |
20 |
=(20-
1 |
20 |
=20×12-
1 |
20 |
=240-
3 |
5 |
=239
2 |
5 |
(4)(1
3 |
4 |
7 |
8 |
7 |
16 |
1 |
7 |
=
7 |
4 |
8 |
7 |
7 |
8 |
8 |
7 |
7 |
16 |
8 |
7 |
=2-1-
1 |
2 |
=
1 |
2 |
(5)3-5-4÷(-12)
=-2+4×
1 |
12 |
=-2×
1 |
3 |
=-
2 |
3 |
(6)60-1998×15
6 |
7 |
=60-0
=60;
(7)(-5)÷(-
1 |
5 |
=5×
1 |
5 |
=5;
(8)25×
3 |
4 |
1 |
2 |
1 |
4 |
=25×(
3 |
4 |
1 |
2 |
1 |
4 |
=25×
3 |
2 |
=
75 |
2 |
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