1樓:匿名使用者
(a+b)(a-b)=a^2-b^2 例:(5+2)乘(5-2)=5^2-2^2。
(a+b)^2=a^2+2ab+b^2.(a-b)^2=a^2-2ab+b^2.
(-a-b)^2=a^2+2ab+b^2.(-a+b)^2=a^2-2ab+b^2.
例:(5+2)=5^2+20+2^2.(-5-2)=5^2+20+2^2.
(5-2)=5^2-20+2^2.(-5+2)=5^2-20+2^2.
1.18.1+(3-0.299÷0.23)×1
2.(6.8-6.8×0.55)÷8.5
3.0.12× 4.8÷0.12×4.84
4.2×1.5+2.5÷(-1.6)
5.(-2)×3.2×(1.5+2.5)÷1.6
6.6-1.6÷4+(6.8-9)
7.38+7.85-5.37÷89
8.7.2÷0.8-1.2×5
9.-1.19×3-0.43
10.6.5×(4.8-1.2×4)
11.68×1.9+0.32×1.9
12.10.15-10.75×0.4-5.7
13.5.8×(3.87-0.13)
14.(-8.01)+4.2×3.74
15.32.52-(6+9.728÷3.2)×2.5
16.[(7.1-5.6)×0.9-1.15] ÷2.5
17.5.4÷[2.6×(3.7-2.9)+0.62]
18.12×6÷(12-7.2)-6
19.12×6÷7.2-6
20.33.02-(148.4-90.85)÷2.5
21.(-5)-252×(-78)
22.(-6) ×(-2)+3÷(5+50)
23.7-7+3-6-(-90)
24.(-8)(-3)×(-8)×25
25.(7+13) ÷(-616)÷(-28)
26.(8+14-100-27)÷4
27.(-15) ÷(-1)-101÷10
28.16÷0.21×(-8) ×(4.1+5.9)
29.(-10) ×(-2) ×4÷
30.[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)
若a²-2a+1=0,則2a²-4a=
關於x的2次3項式的2次項係數和常數項都是1,一次項係數是三分之四的相反數,請寫出這個2次3項式
多項式(a²-25)x³-(a+5)x²+x+3石廣宇x的二次三項式。
(1)求下列各式的值:①a²-4;②(a+2)(a-2);
(2)由①②兩小題的結果,你有什麼發現?
規定一種新的運算,a^b=a+b、a@b=a-b、其中a、b為有理數、請化簡a的平方*b^3ab+5*a的平方*b@4ab、並求出當a=5、b=3時的值是多少?
已知x-y=3,求代數式5-x+y+3(y-x)³的值。
1,3xy 〈6xy-3(xy-1/2x^2y)〉
2,(9x^2+2)(2x+1)
3,(-1-ab^2+a^2b^2/2).4a^2b
4,(1/4-2/3y^2)(-1/4x-2/3y^2)
方程:2x-1/2-2x+5/3=6x-7/6-1
2樓:匿名使用者
2. 8/9 × 15/36 + 1/27 =11/273. 12× 5/6 – 2/9 ×3 =9又1/34.
8× 5/4 + 1/4 =10又1/45. 6÷ 3/8 – 3/8 ÷6 =15又15/166 . 4/7 × 5/9 + 3/7 × 5/9 =5 /9
7 . 5/2 -( 3/2 + 4/5 ) =1/5
8. 7/8 + ( 1/8 + 1/9 )=1又1/9
9. 9 × 5/6 + 5/6 =8又1/310. 3/4 × 8/9 - 1/3 =1/311.
7 × 5/49 + 3/14 =13/1412. 6 ×( 1/2 + 2/3 )=713. 8 × 4/5 + 8 × 11/5 =2414.
31 × 5/6 – 5/6 =2515. 9/7 - ( 2/7 – 10/21 )=61/6316. 5/9 × 18 – 14 × 2/7 =617.
4/5 × 25/16 + 2/3 × 3/4 =1又3/418. 14 × 8/7 – 5/6 × 12/15 =16又2/319. 17/32 – 3/4 × 9/24 =1/420.
3 × 2/9 + 1/3 =1
21. 5/7 × 3/25 + 3/7 =18/3522. 3/14 ×2/3 + 6/7 =123.
1/5 × 2/3 + 5/6 =29/3024. 9/22 + 1/11 ÷ 1/2 =13/22
3樓:
1.x+2+x/2=(3/2)x+1
2.-x+6x=5x
3.x+2x=3x
4.-x/2+x/3=-x/6
5.x/3+x/2+8/9=(5/6)x+8/96.a+8+9=a+17
7.a+2a+3a+...+100a=5050a8.a+3a=4a
9.a-5a+6a=2a
10.a/(1*2)+a/(2*3)+a/(3*4)+...+a/(99*100)=(101/100)a
11.-a+2a-3a+4a-5a+6a-7a+8a=4a12.a+a+a+a+a+a=6a
13.a+7a=8a
14.100a-100a=0
15.a/3+a/6+a/9=(11/18)a
4樓:奇蹟與我有關
5x-5=23 x=28/5
6+1/4x=24 x=72
45-9x=18 x=3
17-11x=23/2 x=1/2
3+3x=15 x=4
3/7x-15=6 x=49
2/3x+13=17 x=6
22+4/3x=34 x=9
64-7x=15 x=7
3x+3/5=3 x=4/5
1、2x+3>0
-3x+5>0
2、2x<-1
x+2>0
3、5x+6<3x
8-7x>4-5x
4、2(1+x)>3(x-7)
4(2x-3)>5(x+2)
5、2x<4
x+3>0
6、1-x>0
x+2<0
7、5+2x>3
x+2<8
8、2x+4<0
1/2(x+8)-2>0
9、5x-2≥3(x+1)
1/2x+1>3/2x-3
10、1+1/2x>2
2(x-3)≤4
1. 5x+3x>2
2. -3y+9<7
3. 9(7+x)<4
4. (3+8)x>6
5. 5-3/1 x>5
6. 11x-5x>3
7. -3a-9a>11
8. -4a+9>6
9. 33x+33<1
10. 5b-9<9b
11.6x+8>3x+8
12.3x-7≥4x-42x-19<7x+31.
13..3x-2(9-x)>3(7+2x)-(11-6x).
15.2(3x-1)-3(4x+5)≤x-4(x-7).
16.2(x-1)-x>3(x-1)-3x-5.
17.3[y-2(y-7)]≤4y.
18.15-(7+5x)≤2x+(5-3x).
19.1+1/2x>2
20.2(x-3)≤4
1.{5x-3>x-4 2.x-2(x-1)<=3 3.(3x-1)/4>3
1+2/3-x<=x-1/3 (2x+5)/3>x (3x-1)/4<=7
4.2x-3>0 5.2-5x<=3(1-x)
4-3x<0 (x+2)/3>2x-1
2x-5<=4x+7
答案:1.x>=1 2.-1<=x<5 3.13/33/2
5.-1/2<=x<1
3x+5x=48 14x-8x=12 6*5+2x=44
20x-50=50 28+6x=88 32-22x=10
24-3x=3 10x*(5+1)=60 99x=100-x
x+3=18 x-6=12 56-2x=20
4y+2=6 x+32=76 3x+6=18
16+8x=40 2x-8=8 4x-3*9=29
8x-3x=105 x-6*5=42 x+5=7
2x+3=10 12x-9x=9 6x+18=48
56x-50x=30 5x=15 78-5x=28
32y-29=3 5x+5=15 89x-9=80
100-20x=20 55x-25x=60 76y-75=1
23y-23=23 4x-20=0 80y+20=100
53x-90=16 2x+9x=11 12y-12=24
80+5x=100 7x-8=6 65x+35=100
19y+y=40 25-5x=15 79y+y=80
42x+28x=140 3x-1=8 90y-90=90
80y-90=70 78y+2y=160 88-x=80
9-4x=1 20x=40 65y-30=100
51y-y=100 85y+1=-86 45x-50=40
5樓:匿名使用者
1. 3/7 × 49/9 - 4/3 =12. 8/9 × 15/36 + 1/27 =11/273.
12× 5/6 – 2/9 ×3 =9又1/34. 8× 5/4 + 1/4 =10又1/45. 6÷ 3/8 – 3/8 ÷6 =15又15/166.
4/7 × 5/9 + 3/7 × 5/9 =5/97. 5/2 -( 3/2 + 4/5 ) =1/58. 7/8 + ( 1/8 + 1/9 )=1又1/99.
9 × 5/6 + 5/6 =8又1/310. 3/4 × 8/9 - 1/3 =1/311. 7 × 5/49 + 3/14 =13/1412.
6 ×( 1/2 + 2/3 )=713. 8 × 4/5 + 8 × 11/5 =2414. 31 × 5/6 – 5/6 =2515.
9/7 - ( 2/7 – 10/21 )=61/6316. 5/9 × 18 – 14 × 2/7 =617. 4/5 × 25/16 + 2/3 × 3/4 =1又3/418.
14 × 8/7 – 5/6 × 12/15 =16又2/319. 17/32 – 3/4 × 9/24 =1/420. 3 × 2/9 + 1/3 =1
21. 5/7 × 3/25 + 3/7 =18/3522. 3/14 ×2/3 + 6/7 =123.
1/5 × 2/3 + 5/6 =29/3024. 9/22 + 1/11 ÷ 1/2 =13/2225. 5/3 × 11/5 + 4/3 =4又5/1226.
45 × 2/3 + 1/3 × 15 =3527. 7/19 + 12/19 × 5/6 =17/1928. 1/4 + 3/4 ÷ 2/3 =1又3/829.
8/7 × 21/16 + 1/2 =230. 101 × 1/5 – 1/5 × 21=1631.50+160÷40 =54
32.120-144÷18+35 =141又4/9算了一箇中午,希望你滿意!
演算法就是那些原則,通分、組合等。
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