
(1)-23+58-5(2)74÷78+23×(-6)(3)10+(-2)×(-5)2(4)-(-2)2×5-(-2)3÷4(5)(12+56-
(1)-23+58-5(2)74÷78+23×(-6)(3)10+(-2)×(-5)2(4)-(-2)2×5-(-2)3÷4(5)(12+56-712)×(-36)...
(1)-23+58-5(2)74÷78+23×(-6)(3)10+(-2)×(-5)2(4)-(-2)2×5-(-2)3÷4(5)(12+56-712)×(-36)
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(1)-23+58-5
=-28+58
=30;
(2)
÷
+
×(-6)
=2-4
=-2;
(3)10+(-2)×(-5)2
=10+(-2)×25
=10-50
=-40;
(4)-(-2)2×5-(-2)3÷4
=-4×5+8÷4
=-20+2
=-18;
(5)(
+
-
)×(-36)
=-
×36-
×36+
×36
=-18-30+21
=-27.
=-28+58
=30;
(2)
7 |
4 |
7 |
8 |
2 |
3 |
=2-4
=-2;
(3)10+(-2)×(-5)2
=10+(-2)×25
=10-50
=-40;
(4)-(-2)2×5-(-2)3÷4
=-4×5+8÷4
=-20+2
=-18;
(5)(
1 |
2 |
5 |
6 |
7 |
12 |
=-
1 |
2 |
5 |
6 |
7 |
12 |
=-18-30+21
=-27.
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