【题目】计算:
(1)0.38+(﹣1.68)﹣(﹣1.68)﹣0.38﹣1
(2)(+2
)﹣(+2
)+(﹣5
)﹣(+4
);
(3)(﹣35
)×(﹣7)
(4)(+3
)×(3
﹣7
)×
÷![]()
(5)﹣8×(﹣12)×0.125×(﹣
)÷1![]()
(6)﹣2.5×7.3+2.5×(﹣2.4)﹣2.5×(﹣1.7)
(7)(1﹣
)2﹣[(1
)÷(﹣1
)]×(﹣1
)3
(8)﹣32﹣[(﹣2)3×(﹣4)÷(﹣
)].
【答案】(1)﹣1
(2)﹣10
(3)245.5
(4)﹣4
(5)﹣2.8
(6)﹣20
(7)﹣4![]()
(8)119
【解析】
(1)0.38+(﹣1.68)﹣(﹣1.68)﹣0.38﹣1
=0.38﹣1.68+1.68﹣0.38﹣1
=﹣1
(2)(+2
)﹣(+2
)+(﹣5
)﹣(+4
)
=+2
﹣2
﹣5
﹣4![]()
=+2
﹣5
﹣(2
+4
)
=﹣3﹣7
=﹣10
(3)(﹣35
)×(﹣7)
=[﹣(35+
)]×(﹣7)
=245+![]()
=245.5
(4)(+3
)×(3
﹣7
)×
÷![]()
=
×(﹣4
)×
×![]()
=
×(﹣
)×
×![]()
=﹣4
(5)﹣8×(﹣12)×0.125×(﹣
)÷1![]()
=96×
×(﹣
)×![]()
=﹣2.8
(6)﹣2.5×7.3+2.5×(﹣2.4)﹣2.5×(﹣1.7)
=2.5×(﹣7.3)+2.5×(﹣2.4)+2.5×1.7
=2.5×[(﹣7.3+(﹣2.4)+1.7]
=2.5×(﹣8)
=﹣20
(7)(1﹣
)2﹣[(1
)÷(﹣1
)]×(﹣1
)3
=
﹣[(
)×(﹣
)]×(﹣1
)3
=
﹣[(﹣
)×(﹣
)]
=
﹣5
=﹣4![]()
(8)﹣32﹣[(﹣2)3×(﹣4)÷(﹣
)]
=﹣9﹣[(﹣8)×(﹣4)×(-4)]
=﹣9+128
=119