用简便方法计算下列各题 (15+25)×2; 3700-2185-815; 12×25; 28×25; 125×(8+4);
用简便方法计算下列各题(15+25)×2;3700-2185-815;12×25;28×25;125×(8+4);32+144+68+56;2847-14×4×25×1;...
用简便方法计算下列各题 (15+25)×2; 3700-2185-815; 12×25; 28×25; 125×(8+4); 32+144+68+56; 2847-14×4×25×1; 60×(15+500); 435+1999; 8×(125+9); 46×18+54×18; (400+16)×5; 170×4+80×4; 103×56; 13×68+13×32.
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(15+25)×2 =15×2+25×2 =30+50 =80; 3700-2185-815 =3700-(2185+815) =3700-3000 =700; 12×25 =3×(4×25) =3×100 =300; 28×25 =7×(4×25) =7×100 =700; 125×(8+4) =125×8+125×4 =1000+500 =1500; 32+144+68+56 =(32+68)+(144+56) =100+200 =300; 2847-14×4×25×1 =2847-14×1×(4×25) =2847-14×100 =2847-1400 =1447; 60×(15+500) =60×15+60×500 =900+30000 =30900; 435+1999 =435+2000-1 =2434; 8×(125+9) =8×125+8×9 =1000+72 =1072; 46×18+54×18 =(46+54)×18 =100×18 =1800; (400+16)×5 =400×5+16×5 =2000+80 =2080; 170×4+80×4 =(170+80)×4 =250×4 =1000; 103×56 =100×56+3×56 =5600+168 =5768; 13×68+13×32 =13×(68+32) =13×100 =1300. |
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