(1)2×(-3)3-4×(-3)+15;
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/11 14:05:38
(1)2×(-3)3-4×(-3)+15;
(2)(
(2)(
1 |
2 |
(1)2×(-3)3-4×(-3)+15
=2×(-27)-4×(-3)+15
=-54-(-12)+15
=-54+12+15
=-54+27
=-(54-27)
=-27;
(2)(
1
2-
5
9+
7
12)×(-36)
=(-36)×
1
2+(-36)×(-
5
9)+(-36)×
7
12
=-18+20+(-21)
=[-18+(-21)]+20
=-39+20
=-(39-20)
=-19;
(3)∵1+2+3+…+31+32+33=17×33,
∴1-3+2-6+3-9+4-12+…+31-93+32-96+33-99
=-2(1+2+3+…+31+32+33)
=-2×17×33
=-1122.
=2×(-27)-4×(-3)+15
=-54-(-12)+15
=-54+12+15
=-54+27
=-(54-27)
=-27;
(2)(
1
2-
5
9+
7
12)×(-36)
=(-36)×
1
2+(-36)×(-
5
9)+(-36)×
7
12
=-18+20+(-21)
=[-18+(-21)]+20
=-39+20
=-(39-20)
=-19;
(3)∵1+2+3+…+31+32+33=17×33,
∴1-3+2-6+3-9+4-12+…+31-93+32-96+33-99
=-2(1+2+3+…+31+32+33)
=-2×17×33
=-1122.
(1)2×(-3)3-4×(-3)+15;
(-1)*(-5/4)*8/15*3/2*(-2/3)*0*(-1)
(2/3-4/5+1/2)÷(-15)
六年级奥数题(1/2+1/3+1/4+…+1/15)+(2/3+2/4+…+2/15)+(3/4+3/5+…+3/15)
(-15)/(1/3-3/2-3)x6
(1)4 6 3 (2)6 9 4 (3)5 8 4 (4)10 15 6
计算:(1)(-3)×(-5)-45÷(-15) (2)3×(-4)+(-28)÷7 (3)(-2.5)×(-4.8)÷
1/2+3/4-6/5 6/7-1/2+4/5 3/4-(7/12-5/7) 2/3+(13/15+1/3) 15/9-
简便算法3/4×13/15+1/4×13/15、(1/2+1/3)×3/5、6除以9+2/3×98、(7/16×1/4)
(-3/4)+1/2;
(3x+5)/2=(2x-1)/3 (3-4x)/5=(3x+4)/15-5/3 解方程
2道数字推理题求解:2/3 3/2 3/4 3 8/3 () 1 2 3/2 8/3 15/8 ()