5.6x+4x=17.28
19175÷59＋678 36.5×1.4－8.51
()÷ 20-[(
14.8×6.3-6.3×6.5＋8.3×3.7 18.1＋（3－0.299÷0.23）×1
5.09－(0.09＋1.23) 9.36－(4.36－3.5)
7.5－2.45＋7.5＋2.45 (-)×21+
)÷
20-[(
-
)×21+
粤公网安备 44130202000953号