计算下列各式 (1)-3
(2)(
(3)(
(4)(7
|
(1)原式=-
+3 2 2
=-2 4
;5 2 4
(2)原式=3-16=-13;
(3)原式=2
-52
+32
=0;2
(4)原式=-(7
-22
)(76
+22
)=-(98-24)=-74.6
计算下列各式 (1)-3
(2)(
(3)(
(4)(7
|
(1)原式=-
+3 2 2
=-2 4
;5 2 4
(2)原式=3-16=-13;
(3)原式=2
-52
+32
=0;2
(4)原式=-(7
-22
)(76
+22
)=-(98-24)=-74.6