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简介:
42+30=72 4.19+(6.81+2.63)=13.63
590+70=660 18.17+(1.83+2.46)=22.46
470+70=540 4.76+3.84+1.16=9.76
303×3=909 5.84+8.95+0.16=14.95
440×0=0 3.77+10.04+12.23=26.04
25×8=2520 8.46+(10.72+10.54)=29.72
20×6=275 3.88+(2.12+8.5)=14.5
420×6=2520 6.43+0.06+5.94=12.43
63÷7=9 4.93+(5.07+1.81)=11.81
25×4=100 6.88+(0.12+8.62)=15.62