题目内容
计算:
(1)﹣3﹣(﹣4)+7
(2)![]()
(3)![]()
(4)![]()
(5)
.
解:(1)﹣3﹣(﹣4)+7
=﹣3+4+7
=﹣3+11
=8;
(2)
=
﹣2
+2
﹣3
=(
+2
)﹣(2
+3
)
=3﹣6=3+(﹣6)
=﹣(6﹣3)
=﹣3;
(3)
=
×(﹣36)+
×(﹣36)﹣
×(﹣36)
=﹣18+(﹣30)+21
=﹣48+21
=﹣(48﹣21)
=﹣27;
(4)
=
×
﹣12×
+12×
=
×27﹣8+2
=3﹣8+2
=﹣3;
(5)
=﹣1﹣
×(﹣3+9)
=﹣1﹣
×6
=﹣1﹣1
=﹣2.
=﹣3+4+7
=﹣3+11
=8;
(2)
=
=(
=3﹣6=3+(﹣6)
=﹣(6﹣3)
=﹣3;
(3)
=
=﹣18+(﹣30)+21
=﹣48+21
=﹣(48﹣21)
=﹣27;
(4)
=
=3﹣8+2
=﹣3;
(5)
=﹣1﹣
=﹣1﹣
=﹣1﹣1
=﹣2.
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