百分数数学题(能简算要简算)①(3/7+2/3-10%)×21 3/5×53%+60%×0.47 ③3/4-(20%+1/3)×4.5

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百分数数学题(能简算要简算)①(3/7+2/3-10%)×21 3/5×53%+60%×0.47 ③3/4-(20%+1/3)×4.5

百分数数学题(能简算要简算)①(3/7+2/3-10%)×21 3/5×53%+60%×0.47 ③3/4-(20%+1/3)×4.5
百分数数学题(能简算要简算)
①(3/7+2/3-10%)×21 3/5×53%+60%×0.47 ③3/4-(20%+1/3)×4.5

百分数数学题(能简算要简算)①(3/7+2/3-10%)×21 3/5×53%+60%×0.47 ③3/4-(20%+1/3)×4.5
①(3/7+2/3-10%)×21 =3*3+2*7-2.1=20.9 (2)3/5×53%+60%×0.47 =60%(53%+47%) =60%=0.6 ③3/4-(20%+1/3)×4.5=3/4-(0.9+1.5)=0.75-2.4=-1.65