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1. 9.76-73.34÷(15.8+3.2)
=9.76-73.34÷19
=9.76-3.86
2. (6+2.56÷3.2)×4.7
=(6+0.8)×4.7
=6×4.7+6×0.8
=28.2+3.76
=31.96
3. 1/2*5+1/5*8+1/8*11+1/11*14
=1/3×[(1/2 - 1/5)+ (1/5 - 1/8)+ (1/8 - 1/11)+ (1/11 - 1/14)]
=1/3 × (1/2 - 1/14)
=1/3 ×3/7
=1/7
4. 1/3*5+1/5*7+1/7*9+1/9*11
= 1/2×[(1/3 - 1/5)+ (1/5 - 1/7)+ (1/7 - 1/9)+ (1/9 - 1/11)]
=1/2 × (1/3 - 1/11)
=1/2 ×8/33
=4/33
5:3/4+3/28+3/70+3/130
=3×[1/(1×4) + 1/(4×7)+1/(7×10)+1/(10×13)]
=1 - 1/13
=12/13
=9.76-73.34÷19
=9.76-3.86
2. (6+2.56÷3.2)×4.7
=(6+0.8)×4.7
=6×4.7+6×0.8
=28.2+3.76
=31.96
3. 1/2*5+1/5*8+1/8*11+1/11*14
=1/3×[(1/2 - 1/5)+ (1/5 - 1/8)+ (1/8 - 1/11)+ (1/11 - 1/14)]
=1/3 × (1/2 - 1/14)
=1/3 ×3/7
=1/7
4. 1/3*5+1/5*7+1/7*9+1/9*11
= 1/2×[(1/3 - 1/5)+ (1/5 - 1/7)+ (1/7 - 1/9)+ (1/9 - 1/11)]
=1/2 × (1/3 - 1/11)
=1/2 ×8/33
=4/33
5:3/4+3/28+3/70+3/130
=3×[1/(1×4) + 1/(4×7)+1/(7×10)+1/(10×13)]
=1 - 1/13
=12/13
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2012-06-04
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(13×8)×125 20×(17×5) 14×20×5 276×38+276×62 102×26
25×(40×32) (5×7)×80 8×14×125×6 16×25×5×4 25×13×4
3×12×5 23×4×5 40×7×3×5 25×6×4×5 3475-1999 2843-598
25×(40×32) (5×7)×80 8×14×125×6 16×25×5×4 25×13×4
3×12×5 23×4×5 40×7×3×5 25×6×4×5 3475-1999 2843-598
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X-2/7X=3/4
70%X + 20%X = 3.6
25% + 10X =4/5
X - 15%X = 68
X+3/8 X=121
5X-3×5/21 =5/11
6X+5 =13.4
X÷(6/35) =(26/45) ×(13/25)
2(x-0.6)=4
(0.5+x)+x=9.8÷2
2(X+X+0.5)=9.8
25000+x=6x
3200=450+5X+X
X-0.8X=6
12x-8x=4.8
7.5*2X=15
1.2x=81.6
x+5.6=9.4
52-x =15
91÷x =1.3
X+8.3=10.7
15x =3
3x-8=16
7(x-2)=2x+3
3x+9=2718(x-2)=270
12x=300-4x
7x+5.3=7.4
3x÷5=4.8
30÷x+25=85
1.4×8-2x=6
6x-12.8×3=0.06
410-3x=170
3(x+0.5)=21
0.5x+8=43
6x-3x=18
(200-x)÷5=30
(x-140)÷70=4
0.1(x+6)=3.3×0.4
4(x-5.6)=1.6
7(6.5+x)=87.5
(27.5-3.5)÷x=4
70%X + 20%X = 3.6
25% + 10X =4/5
X - 15%X = 68
X+3/8 X=121
5X-3×5/21 =5/11
6X+5 =13.4
X÷(6/35) =(26/45) ×(13/25)
2(x-0.6)=4
(0.5+x)+x=9.8÷2
2(X+X+0.5)=9.8
25000+x=6x
3200=450+5X+X
X-0.8X=6
12x-8x=4.8
7.5*2X=15
1.2x=81.6
x+5.6=9.4
52-x =15
91÷x =1.3
X+8.3=10.7
15x =3
3x-8=16
7(x-2)=2x+3
3x+9=2718(x-2)=270
12x=300-4x
7x+5.3=7.4
3x÷5=4.8
30÷x+25=85
1.4×8-2x=6
6x-12.8×3=0.06
410-3x=170
3(x+0.5)=21
0.5x+8=43
6x-3x=18
(200-x)÷5=30
(x-140)÷70=4
0.1(x+6)=3.3×0.4
4(x-5.6)=1.6
7(6.5+x)=87.5
(27.5-3.5)÷x=4
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x-0.25=4分之1 4=0.7x=102 x+36x=156 (36+41)x=77 39%x=102
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