18.9*178.178+0.49-17.8*189.18
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18.9*178.178+0.49-17.8*189.18
简算
简算
=18.9*178.178+0.49-17.8*(189+0.18)
=18.9(178.178-178)+0.49-17.8*0.18
=18.9*0.178+0.49-17.8*0.18
=0.178*(18.9-18)+0.49
=0.178*0.9+0.49
=0.6502
=18.9(178.178-178)+0.49-17.8*0.18
=18.9*0.178+0.49-17.8*0.18
=0.178*(18.9-18)+0.49
=0.178*0.9+0.49
=0.6502
18.9*178.178+0.49-17.8*189.18
18.9×178.178+0.49-17.8×189.189
18.9*178.178+0.49-17.8*189.189
18.9*178.178+0.49-17.8*189.189简便运算,
简便计算:18.9*178.178+0.49-17.8*189.189
简算:18.9*178.178+0.49-17.8*189.189
简便计算 18.9*178.178+0.49-17.8*189.189
用简便方法计算:18.9×178.178+0.49—17.8×189.189
18.9×178.178+0.49-17.8×189.189=(简便运算)
199.199×198﹣198.198×199 18.9×178.178+0.49﹣17.8×189.189 这两题怎么
请教小学数学:用简便方法计算18.9*178.178+0.49一17.8*189.189
199.199*198-198.198*199的简便运算 18.9*178.178 +0.49-17.8*189.189