问题
解答题
计算: (1)(-7)+(-2) (2)(-3)+(-4)-(+11)-(-19) (3)-14+8÷(-2)2-(-4)×(-3) (4)25×
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答案
(1)原式=-9;
(2)原式=-3-4-11+19
=-18+19
=1;
(3)原式=-1+8÷4-12
=-1+2-12
=-11;
(4)原式=25×
+25×3 4
+25×(-1 2
)1 4
=25(
+3 4
-1 2
)1 4
=25