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0.26x5.5十2.6x0.45怎样简便计算?

0.26x5.5十2.6x0.45 =0.26x5.5十0.26x4.5 =0.26×(5.5+4.5) =0.26×10 =2.6 或 0.26x5.5十2.6x0.45 =2.6×0.55+2.6×0.45 =2.6×(5.5+4.5) =2.6×1 =2.6

整数的简便运算,一般是利用运算律,如,交换律,结合律,分配律使运算简便例如, 7+25+3+15 =(7+3)十(25+15) =10+40 =50 3X15十3X45 =3X(15十45) =3X60 =180 复杂一点,要凑整拾,整百。 例如,35X99 =35X(100一1) =35X100一35X1 =3500一35 =3465

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