要用简便演算法：41.2×8.1+9 1/4+53.7×1.9 9 1/4=九又四分之一
要用简便演算法：41.2×8.1+9 1/4+53.7×1.9 9 1/4=九又四分之一
41.2×8.1+9又 1/4+53.7×1.9
=41.2×8.1+9.25+（41.2＋12.5）×1.9
=41.2×8.1+41.2×1.9＋12.5×1.9+9.25
=41.2×（8.1＋1.9）＋1.25×19+1.25＋8
=41.2×10＋1.25×（19＋1）＋8
=412＋8＋1.25×20
=420＋25
=445
41.2×8.1+11×9又1/4+53.7×1.9
原式=41.2×8.1+11×9.25+53.7×1.9
=41.2×8.1+11×9.25+（41.2+12.5）×1.9
=41.2×（8.1+1.9）+11×9.25+12.5×1.9
=41.2×10+11×9.25+19×1.25
=412+11×8+（11+19）×1.25
=412+88+30×1.25
=500+37.5
=537.5
41.2×8.1+11×（9又1/4) 537×0.19 [用简便演算法计算]
41.2×8.1＋11×9.25＋537×0.19 ＝41.2×(10-1.9)+(10＋1)×9.25＋537×0.19 ＝412－41.2×1.9＋92.5＋9.25＋53.7×1.9 ＝412＋92.5＋9.25＋12.5×(2－0.1) ＝412＋92.5＋9.25＋25－1.25 ＝437＋100.5 ＝537.5
(-8.1)÷2又四分之一x4/9x(-1/16)-4+(-2)^3
(-8.1)÷2又四分之一x4/9x(-1/16)-4+(-2)^3
=(-8.1)x4/9x4/9x(-1/16)-4+(-8)
=0.1-4-8
=-11.9
-47×【-1/4】+53×四分之一
-47×【-1/4】+53×1/4
=（47+53）×1/4
=100×1/4
=25
24×1/4加上1/6-8分之一用简便演算法计算
24×1/4加上1/6-8分之一用简便演算法计算
24×1/4加上1/6-8分之一
=24*1/4+24*1/6-24*1/8
=6+4-3
=7
一又四分之一×37.5 12又1/2×1.25用简便方法计算
一又四分之一×37.5 12又1/2×1.25用简便方法计算
1.25*37.5+12.5*1.25
=1.25*（37.5+12.5）
=1.25*50
=62.5
计算172*87+11*9又1/4+53.7*1.9
原式=14964+101.75+102.03
=15167.78
计算172*87+11*9又1/4+53.7*1.9急！
172*87+11*9又1/4+53.7*1.9
=172*87+11*37/4+53.7*(2-0.1)
=172*87+101.75+107.4-5.37
=14964+203.78
=15167.78
3×四分之一+14初4+23×0.25简便演算法
3×四分之一+14÷4+23×0.25
=3×4分之1+14×4分之1+23×4分之1
=（3+14+23）×4分之1
=（17+23）×4分之1
=40×4分之1
=10
12.5×3.2×25
=12.5×（8×0.4）×25
=（12.5×8）×（0.4×25）
=100×10
=1000
25×4.8＋77.5×0.48
=25×4.8+7.75×4.8
=（25+7.75）×4.8
=32.75×4.8
=157.2
十八分之十一×9减十八分之十一×6
=18分之11×9-18分之11×6
=18分之11×（9-6）
=18分之11×3
=6分之11
很高兴为您解答，祝学习进步~
