问题
解答题
计算 (1)-
( 2)-12-[1
(3){0.85-[12+4×(3-10)]}÷5 (4)22+(-2)3×5-(-0.28)÷(-2)2. |
答案
(1)-
×(-2)3-[1-1÷(-21 4
)]÷1 2 4 5
=-
×(-8)-[1+1 4
]÷2 5 4 5
=2-
÷6 5 4 5
=2-1.5
=0.5;
( 2)-12-[1
+(-12)÷6]2×(-3 7
)33 4
=-1-[1
-2]2×(-3 7
)27 64
=-1-[-
]2×(-4 7
)27 64
=-1-
×(-16 49
)27 64
=-1+27 196
=-
;169 196
(3){0.85-[12+4×(3-10)]}÷5
={0.85-[12+4×(-7)]}÷5
={0.85-[12-28]}÷5
={0.85+16}÷5
=16.85÷5
=3.37;
(4)22+(-2)3×5-(-0.28)÷(-2)2
=4+(-8)×5-(-0.28)÷4
=4-40+0.07
=-35.93.