题目内容
计算:①(-3)+(-4)-(-11)-(-19) ②-14÷(-5)2×(-
)+|0.8-1|.
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①原式=-3-4+11+19=23;
②原式=-1÷25×(-
)+0.2=
+
=
+
=
.
②原式=-1÷25×(-
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