计算题: (1)(-12)÷4×(-6)÷2 (2)(-
(3)(-1
(4)(-3)3÷2
|
(1)(-12)÷4×(-6)÷2=(-12)×
×(-6)×1 4
=9.1 2
(2)(-
)×(-4)2-0.25×(-5)×(-4)35 8
=-
×16-0.25×(-4)×(-5)×(-4)2=-10-80=-90.5 8
(3)(-1
)-11 2
+(-21 4
)-(-31 2
)-(-13 4
)1 4
=-1
-11 2
-21 4
+31 2
+13 4 1 4
=(-1
+11 4
)+(-11 4
-21 2
)+31 2
=0-4+33 4
=-3 4
.1 4
(4)(-3)3÷2
×(-1 4
)2+4-22×(-2 3
)1 3
=-27×
×4 9
+4-4×(-4 9
)1 3
=-
+4+16 3
=0.4 3