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9.9×1.3%7.5简便计算

9.9×1.3-7.5=5.37 回答完毕~ 有疑问请追问~无疑问请点击【采纳】~ 祝学习进步\(^o^)/~~~

=10×1.3-0.1×1.3-7.5 =13-0.13-7.5 =12.87-7.5 =5.37

(1)7.5×2.3+1.9×2.5,=2.5×6.9+1.9×2.5,=2.5×(6.9+1.9),=2.5×8.8,=2.5×(4×2.2),=(2.5×4)×2.2,=10×2.2,=22;(2) ( 1 2 + 2 3 - 3 4 - 11 12 )×24 ,= 1 2 ×24+ 2 3 ×24- 3 4 ×24- 11 12 ×24,=12+16-18-22,=(12+16)-(18+22...

3.9=4-0.1,7.8=8-0.2,6.1=6+0.1,7.5=7+0.5,重新带入,提取公因式

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

7.5*2.3+1.9*2.5+12.5*0.4 =2.5*3*2.3+1.9*2.5+2.5*5*0.4 =2.5*(6.9+1.9+2) =2.5*10.8 =2.5*(10+0.8) =2.5*10+2.5*0.8 =25+2 =27

44.1÷3.5-7.5 =88.2÷7-7.5 =12.6-7.5 =5.1 18.36÷3.6×12 =183.6÷36×12 =183.6÷3÷12×12 =183.6÷3 =61.2 87.84÷1.6÷6.1 =878.4÷16÷6.1 =8784÷16÷61 =1098÷2÷61 =549÷61 =9

请把下面数字填入空格中使等式成立 1.3.5.7.9.11.13.15. 口+口+口=30 上面数字可重复使用 此题无解 三个奇数的和还是奇数,不可能得到偶数30

1、95.5-81/7.5-9.2 =14.5/(-1.7) =-145/17 2、9.99/(50*1.11) =(9*1.11)/(50*1.11) =9/50 3、【8+(0.5-0.2)/1.2】*0.24 =8*0.24+0.3/0.2 =(10-2)*0.24+1.5 =2.4-0.48+1.5 =3.9-0.48 =3.42

7.5×2.3+1.9×2.5 =2.5×3×2.3+1.9×2.5 =2.5×6.9+1.9×2.5 =2.5×(6.9+1.9) =2.5×8.8 =2.5×4×2.2 =10×2.2 =22

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