简算运算.
（1）100+99+98-97-96+95+94-93-92+...+7+6-5-4+3+2-1=200
(2)(1+1/2+1/3+1/4)x(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)x(1/2+1/+1/4)=1/5
(3)9999*2222+3333*3334=33330000
(4)9999*7+1111*37=11110000
(5)3333*3333+9999*8889=99990000
(6)7.7*7+7.7+2*7.7=77
(7)125*25*3232*69=696900000
(8)14.8*6.3+45.5*4.5+8.3*3.7+0.465*550-6.3*6.5=548
(9)(2.5+2.5+2.5+2.5)*25*8=2000
(10)97*2000-96*2001=1904
