题目
计算:
(1)
8+(﹣ )﹣5﹣(﹣0.25)
(2)
﹣82+72÷36
(3)
﹣4.2+5.7﹣8.4﹣2.3
(4)
25× +25×(﹣ )
(5)
|﹣0.2|﹣|﹣3﹣(+8)|﹣|﹣8﹣2+10|
(6)
(﹣5)×(﹣8)×(﹣2.5)×9
答案: 解:原式=(8﹣5)+(﹣0.25+0.25), =3+0, =3;
解:原式=﹣82+2=﹣80;
解:原式=(﹣4.2﹣8.4﹣2.3)+5.7, =﹣14.9+5.7, =﹣9.2;
解:原式=25×( 34 ﹣ 14 ), =25× 12 =12.5;
解:原式=0.2﹣|﹣11|﹣|0|, =0.2﹣11﹣0, =﹣10.8
解:原式=﹣(5×9×8×2.5), =﹣900