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7.5x0.8=3÷()

7.5-7.5×0.8 =7.5×(1-0.8) =7.5×0.2 =1.5

0.8乘,(x-7.5)=34 0.8乘,(x-7.5)÷0.8=34÷0.8 x-7.5=42.5 x-7.5+7.5=42.5+7.5 x=50

解0.3x=7.5 x= 7.5除0.3 x=25 知道不

5/8(x-0.3)=7.5% x-0.3=3/25 x=0.12+0.3 x=0.42

(0.5+x)+x=9.8÷22(X+X+0.5)=9.825000+x=6x3200=450+5X+XX-0.8X=612x-8x=4.87.5*2X=151.2x=81.6x+5.6=9.4x-0.7x=3.691÷x=1.3X+8.3=10.715x=33x-8=167(x-2)=2x+33x+9=2718(x-2)=27012x=300-4x7x+5.3=7.43x÷5=4.830÷x+25=851.4×8-2x=66x-12.8×3...

计算下面各题, 0.67×7.5=5.025 9.12×0.8=7.296 8.36x0.25=2.09 1.89÷0.54=3.5 7.1÷0.25=28.4 0.51÷2.2≈0.232 简便计算。 3.14x102 =3.14×100+3.14×2 =314+6.28 =320.68 0.125x7.41x80 =(0.125×80)×7.41 =10×7.41 =74.1 (3.2+0.56)÷0.8 =3.2...

3x+7.5=9.9 3x=9.9-7.5 3x=2.4 x=2.4/3 x=0.8 谢谢,请采纳

7.5x0.8-2.5x2.4 =2.5*(2.4-2.4) =2.5*0 =0

0.75X+3x0.8=7.5 解:0.75X+2.4=7.5 0.75X=5.1 X=6.8

解:金属零件浸没在油中受到的浮力F浮=F-F'=7.5N-6.6N=0.9N. 由阿基米德原理F浮=ρ油gV排,得金属零件排开油的体积V排=F浮/ρ油g=0.9N÷(0.8×10³kg/m³×10N/kg)=0.0001125m³. ∵金属零件浸没在油中,∴金属零件的体积V物=V排=0.000...

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