
计算:(1)(-4)-(+13)+(-5)-(-9)(2)24×(18?13+14)(3)-32×(-2)+42÷(-2)3(4)4(x2-5
计算:(1)(-4)-(+13)+(-5)-(-9)(2)24×(18?13+14)(3)-32×(-2)+42÷(-2)3(4)4(x2-5x)-5(2x2+3x)(5...
计算:(1)(-4)-(+13)+(-5)-(-9)(2)24×(18?13+14)(3)-32×(-2)+42÷(-2)3(4)4(x2-5x)-5(2x2+3x)(5)|-79|÷(23?15)-13×(-4)2.
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(1)原式=-4-13-5+9
=-17-5+9
=-22+9
=-13;
(2)原式=24×
-24×
+24×
=3-8+6
=1;
(3)原式=-9×(-2)+16÷8
=18+2
=20;
(4)原式=4x2-20x-10x2-15x
=(4-10)x2-(20+15)x
=-6x2-35x;
(5)原式=
÷
-
×16
=
×
-
=-
.
=-17-5+9
=-22+9
=-13;
(2)原式=24×
1 |
8 |
1 |
3 |
1 |
4 |
=3-8+6
=1;
(3)原式=-9×(-2)+16÷8
=18+2
=20;
(4)原式=4x2-20x-10x2-15x
=(4-10)x2-(20+15)x
=-6x2-35x;
(5)原式=
7 |
9 |
7 |
15 |
1 |
3 |
=
7 |
9 |
15 |
7 |
16 |
3 |
=-
11 |
3 |
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