(1)4/7÷[1/3×(3/5-3/10)]
(2)(4/5+1/4)÷7/3+7/10
(3)12.78-0÷( 13.4+156.6 )+ 37.812-700÷(9+31×11)- (136+64)×(65-345÷23)/ 3.2×(1.5+2.5)÷1.6
(4)85+14×(14+208÷26)
(5)(6.8-6.8×0.55)÷8.5
(6) (284+16)×(512-8208÷18)
(7)0.12× 4.8÷0.12×4.8
(8)(3.2×1.5+2.5)÷1.6
(9)4×(25×65+25×28)+ 138×25×4* (13×125)×(3×8) +(12+24+80)×50
(10)25×32×125
(11)32×(25+125)
(12)102×76
(13) 58×98
(14)280+840÷24×5
(15)85×(95-1440÷24)
(16)58870÷(105+20×2)
(17)80400-(4300+870÷15)
(18)1437×27+27×563
(19)81432÷(13×52+78)
(20)125×(33-1)
(21)37.4-(8.6+7.24-6.6)