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最佳答案:2.8×0.4= 1.1214-7.4=6.6,1.92÷0.04=48,0.32×500=160,0.65+4.35= 510-5.4=4.6,4÷20=0.
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最佳答案:3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 +