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0.25x28

0.25×0.4×0.7=0.1×0.7=0.07

简便运算0.25x6.72+0.25x3.28 0.25x6.72+0.25x3.28 =0.25*(6.72+3.28) =0.25*10 =2.5

16克SO2物质的量为16/64=0.25mol, 体积为22.4x0.25=5.6升,2。相同条件,。体积与物质的量成正比,同体积同物质的量nN2=0.25mol mN2=0.25x28=7克3,0.25mol...

亲,提公因式64.28*0.5378用分配律

32.14,用乘法分配律

原式=23.3*1.25+56*1.25+1.25*28.7 =1.25*(23.3+56+28.7) =1.25*108 =1.25*(100+8) =1.25*100+1.25*8=125+10=135

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