用简便方法计算下面各题. ①284+378+122+216 ②125×5×7×8 ③82×99
用简便方法计算下面各题.①284+378+122+216②125×5×7×8③82×99④44×27+27×55+27⑤960÷6÷16⑥1352-(352+365)⑦1...
用简便方法计算下面各题. ①284+378+122+216 ②125×5×7×8 ③82×99 ④44×27+27×55+27 ⑤960÷6÷16 ⑥1352-(352+365) ⑦14.25+7.3+5.75+2.7 ⑧18.23-6.35-2.65 ⑨16.78-2.54+3.22-1.46 ⑩26.54-(5.23+6.54)
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①284+378+122+216 =(284+216)+(378+122) =500+500 =1000; ②125×5×7×8 =(125×8)×(5×7) =1000×35 =35000; ③82×99 =82×(100-1) =82×100-82×1 =8200-82 =8118; ④44×27+27×55+27 =(44+55+1)×27 =100×27 =2700; ⑤960÷6÷16 =960÷(6×16) =960÷96 =10; ⑥1352-(352+365) =1352-352-365 =1000-365 =635; ⑦14.25+7.3+5.75+2.7 =(14.25+5.75)+(7.3+2.7) =20+10 =30; ⑧18.23-6.35-2.65 =18.23-(6.35+2.65) =18.23-9 =9.23; ⑨16.78-2.54+3.22-1.46 =(16.78+3.22)-(2.54+1.46) =20-4 =16; ⑩26.54-(5.23+6.54) =26.54-5.23-6.54 =26.54-6.54-5.23 =20-5.23 =14.77. |
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