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7.5:7.8=2.5:x

7.8x7.5+7.8x2.5 =7.8×(7.5+2.5) =7.8×10 =78 ======================================== 柳浪闻莺各位芝麻竭诚为您解答 您的采纳是我们坚持百度的动力

=7.8x(2.5+7.5) =7.8x10 =78

7.8—7.5+2.2—2.5. =(7.8—7.5)+(2.2—2.5.) =0.3-0.3 =0 望采纳

7.8x7.5+7.8x2.6-78 =7.8x7.5+7.8x2.6-7.8x10 =7.8x(7.5+2.6-10) =7.8x 0 . 1 = 0 . 78

把第二项和第三项对调,计算结果为0。

0.87*2.5+8.7*7.5 =8.7*2.5-0.87*2.5*9+8.7*7.5 =87-79.575 =67.425

7.8-7.5+2.2-2.5 =(7.8+2.2)-(7.5+2.5) =10-10 =0

7.5x8÷3x7.8 =2.5x8x7.8 =156克

0.87×25+8.7×7.5 =8.7×2.5+8.7×7.5 =8.7x(2.5+7.5) =8.7x10 =87 希望帮到你 望采纳 谢谢 加油~

原式=7.8*3.6+1.4*(7.5+0.3)-1.4*0.3 =7.8*(3.6+1.4)-0.42 =7.8*5-0.42 =39-0.42 =38.58

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