（1+1/2)(1+1/3)(1+1/4).(1+1/100)
（1-1/2)(1-1/3)(1-1/4).(1-1/100)
25*4/25*4
7.26-(5.26-1.5)
6.25+3.85-2.125+3.875
9-2456*21
0.5/11.5-4*2.75
3.375+5.75+2.25+6.625
1001－9036÷18
3.8×5.25+14.5
2.1*4.3+5.7*2.1
102*45-328
2.8*3.1+17.6/8
（50-12.5)/2.5
2/5×1/3
6110*47+639
解方程：
[5x*56+(-3^3-x)]/9=5
89x/3-5^2-(8-5x)/5=541
x+7-(-36+8^2)/2=8+7^4/3
89/2+35/6x=3*9+2^3/5+7x
3X+189/3=521/2
4Y+119*^3=22/11
7(2x-1)-3(4x-1)/9=[4(3x+2)-1]/9
[(5y+1)+ (1-y)]/2= [(9y+1)+ (1-3y)]/3
2/3*8*1/4x=89/2
2(x-2)/6+2/9=(x+1)/2
2(x-2)/2-3(4x-1)/3=9(1-x)/2
11x/2+(64-2x)/6=(100-9x)/8
15-(8-5x)/2=7x/3+(4-3x)/4
3(x-7)/4-2[9-4(2-x)]/9=22/3
3/2[2/3(1/4x-1)-2]-x/9=2/5
2x+7^2/2=157/5
[(87x-5*8)+(-9*5)]-7x=150
5x+(-7^2)/2-5/8=136/5
1/9+5/8x-(-1/8+5/2x)=64
知道了?