口算。 75+35= 28+38= 142+58= 364+636= 82-28= 95-69= 345-99= 200-101= 300+600= 523-212= 420+300= 149-108=
3.5×(20.6-16.8÷4.8) 16.2÷(3.2×0.25+4.6)
2.5÷[(17.2-4.5×3.6)÷0.04] 4.5÷0.25-0.75×1.2
(66-32×1.2)÷0.25 12.5×(1618-8.4÷0.12)
(7.2-3.15)÷0.6×1.396.5×43.5+43.5×28.5-25×43.5
8.1×1.3-8×1.3+1.9×1.3+11.9÷1.36[(7.6-5.2)÷0.4+2.54]×32