题目内容
计算:
(1)12+(﹣7
)﹣(﹣18)﹣32.5;
(2)(﹣
)×1.5÷(﹣2
);
(3)(﹣2)3×∣﹣3∣﹣(﹣16.5);
(4)(
﹣
+
)÷(﹣
);

(5)﹣3×[(﹣4)2+2] ﹣(﹣3)2÷(﹣2).
(1)12+(﹣7
(2)(﹣
(3)(﹣2)3×∣﹣3∣﹣(﹣16.5);
(4)(
(5)﹣3×[(﹣4)2+2] ﹣(﹣3)2÷(﹣2).
解:(1)原式=12﹣7.5+18﹣32.5=﹣10;
(2)原式=﹣
×
×(﹣
)=
;
(3)原式=﹣8×3+16.5=﹣7.5;
(4)原式=(
﹣
+
)×(﹣42)
=
×(﹣42)﹣
×(﹣42)+
×(﹣42)
=﹣14+22﹣9
=﹣1;
(5)原式=﹣3×[16+2] ﹣9÷(﹣2)
=﹣3×18﹣9÷(﹣2)
=﹣54+4.5
=﹣49.5.
(2)原式=﹣
(3)原式=﹣8×3+16.5=﹣7.5;
(4)原式=(
=
=﹣14+22﹣9
=﹣1;
(5)原式=﹣3×[16+2] ﹣9÷(﹣2)
=﹣3×18﹣9÷(﹣2)
=﹣54+4.5
=﹣49.5.
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