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2.5加7.5竖式

7.5÷2.5 =75÷25 =3 竖式见图:

2.5+7.5-2.5+7.5=(2.5-2.5))+(7.5+7.5)=0+15=15

45.55-(6.82+15.55) 34.52-17.87-12.23 6.43-(1.4-0.57) 23.75-8.64-3.46 17.83-9.5-7.83-0.5 5.38+88.2-2.38+1.8 27.38-5.34+2.62-4.66 21.63-(8.5+9.63) 7.5-2.45+7.5+2.45 5.09-(0.09+1.23) 9.36-(4.36-3.5) 609-708+306-108+202-198+497-100

原式=2.5*7+2.5*3 =2.5*(7+3) =2.5*10 =25

应该是 2.08 x 7.5 ----------------- 1040 1456 ----------------- 15.600

2.5加7.5除以1.25怎么简算=2.5+7.5÷0.25÷5=2.5+30÷5=2.5+6=8.5

(1)2.08*7.5=15.6; 2.0 8* 7.5 1040 1456 15.600 (2)32.5÷2.5=13; 1 32.5 32.5 25 75 75 0 (3)78.6÷11=7.1? ? 45 . 7.1454511 78.6 77 16 11 50 44 60 55 50 44 60 55 5

x÷2.5+7.5=10x÷2.5=10-7.5x=2.5*2.5x=6.25

2.5+7.5*6=2.5+45=47.5直接计算简便

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*8.8 =2.5*4*2.2 =10*2.2 =22

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