计算:(1)-8-12+2;(2)-18+(-7.5)-(-31)-12.5;(3)(14?56+13+32)×(?12);(4)-125÷(-25)-
计算:(1)-8-12+2;(2)-18+(-7.5)-(-31)-12.5;(3)(14?56+13+32)×(?12);(4)-125÷(-25)-64÷(-4);(...
计算:(1)-8-12+2;(2)-18+(-7.5)-(-31)-12.5;(3)(14?56+13+32)×(?12);(4)-125÷(-25)-64÷(-4);(5)-54×214÷(-412)×29;(6)991617×(-17);(7)(15?12?512)÷(?160);(8)-1-(1-0.5)×0×[2-(-3)2].
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(1)原式=-8+(-12)+2
=-20+2
=-18;
(2)原式=-18+(-7.5)+31+(-12.5)
=[(-18)+(-7.5)+(-12.5)]+31
=-38+31
=-7;
(3)原式=(-12)×
-(-12)×
+(-12)×
+(-12)×
=-3+10-4-18
=-15;
(4)原式=-5-(16)
=-5+16
=11;
(5)原式=-54×
×(-
)×
=4;
(6)原式=(100-
)×(-17)
=-1700+1
=-1699;
(7)原式=(
-
-
)×(-60)
=(-60)×
-(-60)×
-(-60)×
=-12+30+25
=43;
(8)原式=-1-0.5×0×(-7)
=-1-0
=-1.
=-20+2
=-18;
(2)原式=-18+(-7.5)+31+(-12.5)
=[(-18)+(-7.5)+(-12.5)]+31
=-38+31
=-7;
(3)原式=(-12)×
1 |
4 |
5 |
6 |
1 |
3 |
3 |
2 |
=-3+10-4-18
=-15;
(4)原式=-5-(16)
=-5+16
=11;
(5)原式=-54×
9 |
4 |
2 |
9 |
2 |
9 |
=4;
(6)原式=(100-
1 |
17 |
=-1700+1
=-1699;
(7)原式=(
1 |
5 |
1 |
2 |
5 |
12 |
=(-60)×
1 |
5 |
1 |
2 |
5 |
12 |
=-12+30+25
=43;
(8)原式=-1-0.5×0×(-7)
=-1-0
=-1.
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