问题
解答题
计算(能简便的用简便方法计算): (1)(-16)-[(-5
(2)1÷(1-
(3)(-
(4)
(5)(-98)×(-0.125)+(-98)×
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答案
(1)原式=-16-(-9+1)=-16+9-1=-8;
(2)原式=1×2×
×3 2
×4 3
×5 4
=6;6 5
(3)原式=-
÷(7 8
-42 24
-21 24
)=-14 24
×7 8
=-3;24 7
(4)原式=
=2;-8+12×4 1+19
(5)原式=(-98)×(-0.125+
-1 8
)=(-98)×(-4 7
+1 8
-1 8
)=-98×(-4 7
)=56.4 7