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脱式计算能简便的要简便二点5×4点四怎么简便

2.5×4.4 =2.5×4×1.1 =10×1.1 =11

4.3×1.2×4 =4.3×4.8 =4.3×5-4.3×0.2 =21.5-0.86 =21.5-1+0.14 =20.64

4.8×0.98 =4.8×1-4.8×0.02 =4.8-0.096 =4.704

2.6*(5.3+4.7)=26

3.6×5.4+3.6×4.6=3.6×(5.4+4.6)=3.6×10=36 望采纳

5.2-7.2×0.45 =5.2-3.24 =1.96

电线的载流量与其散热条件有关,越粗相对承载的电流量越小,下面是口诀:\r\n\r\n\r\n铝芯绝缘导线载流量与截面的倍数关系 \r\n截面:1 1.5 2.5 4 6 10 16 25 35 50 70 95 120 \r\n倍数:9 9 9 8 7 6 5 4 3.5 3 3 2.5 2.5 \r\n电流:9 14 23 32 ...

(1)4.9×4+5.1÷0.25 =4.9×4+5.1÷14 =4.9×4+5.1×4=(4.9+5.1)×4=10×4=40(2)5-34+14=5-(34-14)=5-12=412(3)56+(613-16)-613 =(56-16)+(613-613)=23(4)56-18+16=(56+16)-18 =1-18=78

5.52/0.25/2.4 =21/2.4 =8.75 答:答案是8.75。

简便方法计算如下: (12.5+102.5×7)×2.5×0.4 =[12.5+(90+12.5)x7]x2.5x0.4 =(12.5+90x7+12.5x7)x1 =12.5x(1+7)+90x7 =12.5x8+630 =100+630 =730

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