用简便方法计算下列各题. 137+86+63 254+(524+146) 262-186-14 381-199 228+107 323-(223
用简便方法计算下列各题.137+86+63254+(524+146)262-186-14381-199228+107323-(223+65)178+297168+249+...
用简便方法计算下列各题. 137+86+63 254+(524+146) 262-186-14 381-199 228+107 323-(223+65) 178+297 168+249+132+451 694+238-594.
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①137+86+63, =(137+63)+86, =200+86, =286; ②254+(524+146), =524+(254+146), =524+400, =924; ③262-186-14, =262-(186+14), =262-200, =62; ④381-199, =381-200+1, =182; ⑤228+107, =228+100+7, =335; ⑥323-(223+65), =323-223-65, =35; ⑦178+297, =178+300-3, =475; ⑧168+249+132+451, =(168+132)+(249+451), =300+700, =1000; ⑨694+238-594, =694-594+238, =100+238, =338. |
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