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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

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

2.5x2.3 +1.9x7.5简便计算 =2.5x2.3+1.9x3x2.5 =2.5x(2.3+1.9x3) =2.5x(2.3+5.7) =2.5x8 =20

7.5+1.43/1.3-2.9 =7.5+1.1-2.9 =8.6-2.9 =5.7

第n组为n×(2n-1)

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

-7.5×(-11又1/9)-16又2/3 =-15/2×(-100/9)-50/3 =750/9-150/9 =600/9 =200/3 如果帮到你,请记得采纳,O(∩_∩)O谢谢

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

(7.5×9.9 +75×0.16-750×0.015)÷(1/2-1/3)×6 =(7.5×9.9 +7.5×1.6-7.5×1.5)÷(1/2-1/3)×6 =7.5x(9.9+1.6-1.5)÷(1/6)*6 =75*6*6 =2700

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