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问题: 题目

12.5*56=12.5*8*()
0.75*40=0.3*()*40
3.87*18-38.7*0.8=()*(18-8)
0.27*1.5+()*1.5+1.5*0.32=0.77*1.5
10.02*37.2=372+()
9.9*21.4=214-()
0.485*1021-48.5=()*(1.02-10
9.2*1.01=9.2*()+9.2
7.2+99=7.2+()-()

解答:

12.5*56=12.5*8*(7)
0.75*40=0.3*(2.5)*40
3.87*18-38.7*0.8=(3.87)*(18-8)
0.27*1.5+(0.5)*1.5+1.5*0.32=0.77*1.5
10.02*37.2=372+(0.02*372)
9.9*21.4=214-(0.1)
0.485*1021-48.5=(4.85)*(1.02-10
9.2*1.01=9.2*(0.01)+9.2
7.2+99=7.2+(100)-(1)