
计算:(1)(-3)2×23-(-4)÷2(2)(-34+16-38)×(-24
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(1)(-3)2×23-(-4)÷2
=9×8+2
=72+2
=74;
(2)(-
+
-
)×(-24)
=
×24-
×24+
×24
=18-4+9
=23.
=9×8+2
=72+2
=74;
(2)(-
3 |
4 |
1 |
6 |
3 |
8 |
=
3 |
4 |
1 |
6 |
3 |
8 |
=18-4+9
=23.
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