(1).(2-1.6×0.5+1.2)除以8% =(2-0.8+1.2)除以8% =(1.2+1.2)除以8% =2.4除以8% =30 (2).96%除以3-(0.6+204×0.2) =96%除以3-(0.6+0.48) =96%除以(3-1.08) =0.96除以1.92 =0.5 (3)250%×15%×240% =2.5×0.15×(0.4×6) =2.5×0.15×0.4×6 =(2.5×0.4)×(0.15×6) =1×0.9 =0.9 (4)12.5%×19+12.5%×1.3 =(1.25×1.9)+(1.25×1.3) =1.25×(1.9+1.3) =1.25×3.2 =1.25×8×0.4 =10×0.4 =4 (5)(2-1.6×0.5+1.2)除以8% =(2-0.8+1.2)除以0.08 =(1.2+1.2)除以0.08 =30 (6)96%除以3-(0.6+2.4×0.2) =0.96除以3-(0.6+0.48) =0.96(3-1.08) =0.96除以1.92 =0.5 (7) 60%+2.1除以12% =0.6+17.5 =18.1 (8)5.6×16.5除以70%除以1.1 =5.6×16.5除以(0.7×1.1) =5.6×16.5除以0.77 =94.2除以0.77 =120 (9)15%×1.25×6×80% =(0.15×6)×(1.25×0.8) =0.9×1 0.9 (10)6.78×999%+67.8% =677.322+0.678 =678 小学数学解方程的方法与技巧:工具:依据加减乘除法各部分间的关系。依据等式的性质:等式的两边都加上或减去同一个数,等式仍然成立。等式的两边都乘一个数或除昌拍以一个不为0的数,等式仍然成立把等式中某一项从等式一边移到另一边,叫做移项;移项时运算符号要改变,即加一个数移到另一边变为减一个数,减一个数移到另一边变为加一个数租悔,乘一个数移到另一边变为除以一个数,除以一个数移到另一边变为乘一耐型羡个数。技巧:整体思想,移项合并思想。
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