题文
神机妙算:(能简算的要写出简算过程) (1)( -)×28+4×7-3×7 (2)×78+0.5×1.25-730÷80+24×+51× (3)[22.5+(3+1.8-1.21×)]÷40% (4)[47-(18.75-1÷)×2]÷0.46 (5)(0.7×-0.11×)÷0.125+(-)÷(×) |
题型:解答题 难度:中档
答案
(1)(-)×28+4×7-3×7, =×28-×28+(4-3)×7, =7-4+1×7, =3+7, =10;
(2)×78+0.5×1.25-730÷80+24×+51×, =0.125×78+5×0.125-73×0.125+51×+51×, =(78+5-73)×0.125+51×(+), =10×0.125+51×1, =1.25+51, =52.25;
(3)[22.5+(3+1.8-1.21×)]÷40%, =[22.5+(3+1.8-0.55)]÷40%, =[22.5+(5.4-0.55)]÷40%, =[22.5+4.85]÷40%, =27.35÷40%, =68.375;
(4)[47-(18.75-1÷)×2]÷0.46, =[47-(18.75-1.875)×2]÷0.46, =[47-16.875×2]÷0.46, =[47-33.75]÷0.46, =13.25÷0.46, =28;
(5)(0.7×-0.11×)÷0.125+(-)÷(×), =(-)÷0.125+÷, =÷0.125+÷, =3+, =3. |
据专家权威分析,试题“神机妙算:(能简算的要写出简算过程)(1)(14-17)×28+447×7-347×7(2..”主要考查你对 整数,小数,分数,百分数和比例的混合计算 等考点的理解。关于这些考点的“档案”如下:
整数,小数,分数,百分数和比例的混合计算
考点名称:整数,小数,分数,百分数和比例的混合计算
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