题目内容
计算:
①(
-1)2+(
+2)2-2(
-1)(
+1)
②(5
-6
+4
)÷
.
①(
3 |
3 |
3 |
3 |
②(5
48 |
27 |
15 |
3 |
①(
-1)2+(
+2)2-2(
-1)(
+1)
=3-2
+1+3+4
+4-6+2
=2
+7;
②(5
-6
+4
)÷
=(20
-18
+4
)÷
=(2
+4
)÷
=2+4
.
3 |
3 |
3 |
3 |
=3-2
3 |
3 |
=2
3 |
②(5
48 |
27 |
15 |
3 |
=(20
3 |
3 |
15 |
3 |
=(2
3 |
15 |
3 |
=2+4
5 |
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