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1.08×9+1.08的脱式计算怎样做术士

1.08×9.9 =1.08×(10-0.1) =1.08×10-1.08×0.1 =10.8-0.108 =10.692 你好,本题已解答,如果满意 请点右上角“采纳答案”。

1.08x9.8 =1.08x(10-0.2) =1.08x10-1.08x0.2 =10.8-0.216 =10.584

首先要先化成单位统一的数值。9元7角1分等于9.71元,4元08分等于4.08元。9元7角1分减4元08分即9.71-4.08=5.63元。

(1+3+5+7+…+299)-(2+4+6+…+298) = 1 + (3-2) + (45-4) + ...... + (299-298) = 1+(1+1+......+1 ) = 1+149 =150 321-1-3-5-7-9-11-13-15-17-19 = 312 - 10 * (1+19)/2 = 312 - 100 = 212 1+2+3+...+50 = 50 * (1+50) = 5050

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