36.178-145÷5×6+42 420+580-64×21÷28 49.5.8×(3.87-0.13)+4.2×3.74
37.812-700÷(9+31×11) (136+64)×50.32.52-(6+9.728÷3.2)×2.5
(65-345÷23) 51.[(7.1-5.6)×0.9-1.15] ÷2.5
38.85+14×(14+208÷26) 52.5.4÷[2.6×(3.7-2.9)+0.62]
39.(284+16)×(512-8208÷18) 53.12×6÷(12-7.2)-6 (4)12×6÷7.2-6
40.120-36×4÷18+35
41.(58+37)÷(64-9×5) 102×4.5
42.(6.8-6.8×0.55)÷8.5 7.8×6.9+2.2×6.9
43.0.12× 4.8÷0.12×4.8 5.6×0.25
44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)8×(20-1.25)
÷1.6 1)127+352+73+44 (2)89+276+135+33
45.6-1.6÷4= 5.38+7.85-5.37= (1)25+71+75+29 +88 (2)
46.7.2÷0.8-1.2×5= 6-1.19×3-0.43= 243+89+111+57
47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9 9405-2940÷28×21
48.10.15-10.75×0.4-5.7
7
920-1680÷40÷7