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77加2.7加2.8加25脱式计算

5.6+2.7+4.5=8.3+4.5=12.8,7.7+2.7+2.8+25=10.4+2.8+25=13.2+25=38.2,8.7-5.69+2.03=3.01+2.035.04,51.27-8.03-1.34=43.24-1.34=41.9,10.75+0.4-9.86=11.15-9.86=1.29,请采纳

14.8和107.5

77+2.7+2.8+25=(77+25)+(2.7+2.8)=102+5.5=107.5

77+2.7+2.8+25用以简便运算=77+25+(2.7+2.8)=102+5.5=107.5

77+2.7+2.8+25=75+2+2.7+2.3+0.5+25=75+25+2.7+2.3+2+0.5=100+5+2+0.5=107.5

77+10+25=87+25=112

77+2.5+2.8+25=77+5.5+25=77+30.5=107.5

原式=77+(2.7+2.3)+25 =77+5+25 =77+(25+5) =77+30 =107

14.8和107.5

7加上二点儿7+2点8+25用脱式计算怎样计算7.2+2.8+25=10+25=35直接诶计算

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