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2.5x56+4.5x65的简便算

=2.5×56+9×0.5×5×13 =2.5×56+117×2.5 =2.5×173 =2.5×172+2.5×1 =2.5×4×43+2.5 =10×43+2.5 =430+2.5 =432.5

5Ⅹ56十4.5x65 =280+292.5 =572.5

125x56 =125x8x7 =1000x7 =7000 99x65十165 =99x65十65+100 =(99+1)x65+100 =100x65+100 =6500+100 =6600 25十350x20一1364 =25+7000-1364 =7025-1364 =5661

原式 =56x(65-65) =56x0 =0 供参考。

56x65-65x56 =56×(65-65) =0

X65就是材质,API标准是美标,至于16Mn或者20#是国内的标准,所谓X42是16Mn,指的是材质接近可替代,现在国内生产API标准的管的厂家大把

985x56 =(1000-15)x65 =1000x65-15x65 =65000-15x(70-5) =65000-15x70+15x5 =65000-1050+75 =65075-1050 =64025 谢谢,请采纳

56×36-56+56×65 =56×(36-1+65) =56×(35+65) =56×100 =5600

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