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1.口算:
7.1×4= 10-0.78= 5.6÷1.4= 15-9.3= 9.6÷0.4= 7.8÷3=
5.9-0.81= 4.72+5.28= 2.7×0.5= 0.3×0.4= 8.94+3.14= 4.5×4=
2.计算
206×18+292 48.9+34.6×2.1
1.口算:
7.1×4= 10-0.78= 5.6÷1.4= 15-9.3= 9.6÷0.4= 7.8÷3=
5.9-0.81= 4.72+5.28= 2.7×0.5= 0.3×0.4= 8.94+3.14= 4.5×4=
2.计算
206×18+292 48.9+34.6×2.1