(1)30.8÷[14－(9.85＋1.07)] (2) [60－(9.5＋28.9)]÷0.18 (3)2.881÷0.43－0.24×3.5 (4) 20×[(2.44－1.8)÷0.4＋0.15] (5)28-(3.4+1.25×2.4) (6) 2.55×7.1+2.45×7.1 (7)777×9+1111×3 (8) 0.8×[15.5-(3.21+5.79)] (9)（31.8+3.2×4）÷5 (10) 31.5×4÷(6+3) (11)0.64×25×7.8+2.2 (12) 2÷2.5+2.5÷2 (13)194－64.8÷1.8×0.9 (14) 36.72÷4.25×9.9 (15)5180－705×6 (16) 24÷2.4－2.5×0.8 (17)(4121+2389)÷7 (18) 671×15-974 (19)0.8×[7.9-(2+5)] (20) 469×12+1492 (21)405×(3213-3189) (22) 3.416÷（0.016×35） (23)0.8×[(10－6.76)÷1.2] (1)10(2)120(3)5.86(4)35(5)21.6(6)35.5(7)10 326(8)5.2(9)8.92(10)14(11)127(12)2.05(13)161.6(14)85.536(15)950(16)8(17)930(18)9091(19)0.72(20)7120(21)9720(22)6.1(23)2.16
