①38+56÷7×4
②940×[128-(154-31)]
③209+102÷(52-35)
④450+390÷130-123
38+513 264+(73+37) 187+42+158 513+38(264+73)+37 187+(42+158)364+78+154 78+(364+154)
2.03+6.2= 2.37+2.63= 10-9.2= 36.6-6= 10.2×100=
0.3+0.7= 1.5÷100= 12.6-10.02= 5.5÷1000= 100÷25×4=
①8100÷25÷81
②38.46-7.1-2.9
③25×16
④64×[480÷(76+4) ]