10以内的小数加减乘除的简便运算

1.8/2
0.6x0.8
1.2+5.9
4.5_0.6

（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

1) 11×76+69×60=
(2) 70-13+95-8=
(3) 99×83-91÷46=
(4) 6+97+83÷22=
(5) 37÷54-30×46=
(6) 98-62-71-70=
(7) 24÷31×28÷31=
(8) 50+18÷63×8=
(9) 70÷77÷9÷68=
(10) 11+88+85+70=
(11) 20÷6+9÷49=
(12) 99-28+14÷6=
(13) 75×99-95-7=
(14) 35×55-91+96=
(15) 27+37×98+52=
(16) 56×68÷63×82=
(17) 69÷22÷31×89=
(18) 50÷78×93÷90=
(19) 36+3-15+45=
(20) 74×30÷91+54=
(21) 17×99÷7÷92=
(22) 83÷25-43-43=
(23