3.5*五分之四+5.5*80%+0.8=?计算,能简算的要简算

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3.5*五分之四+5.5*80%+0.8=?计算,能简算的要简算
3.5*五分之四+5.5*80%+0.8=?计算,能简算的要简算

3.5*五分之四+5.5*80%+0.8=?计算,能简算的要简算
原式=(3.5+5.5+0.8)*4/5
=9.8*0.8
=7.84

3.5*五分之四+5.5*80%+0.8=3.5x0.8+5.5x0.8+1x0.8=(3.5+5.5+1)x0.8=10x0.8=8

4/5 , 3.5=7/2 , 5.5=11/2 , 80%=4/5 , 0.8=4/5
4/5 * 7/2 + 11/2 * 4/5 + 4/5=4/5 * (7/2 + 11/2 + 1)=4/5 * 10=8

3.5*五分之四+5.5*80%+0.8
=3.5×0.8+5.5×0.8+0.8
=(3.5+5.5+1)×0.8
=10×0.8
=8

4/5(7/2+11/2+1)=8

3.5*五分之四+5.5*80%+0.8
=3.5×0.8+5.5×0.8+0.8
=(3.5+5.5+1)×0.8
=10×0.8
=8