计算下列各题(能简算的要简算)( 2 3 + 2 15 )×45 3
计算下列各题(能简算的要简算)(23+215)×45313×25+1013×0.8-0.80.25×58×4×1.6(112+2.25)÷〔(313-112)÷129〕...
计算下列各题(能简算的要简算)( 2 3 + 2 15 )×45 3 13 × 2 5 + 10 13 ×0.8-0.80.25× 5 8 ×4×1.6 (1 1 2 +2.25)÷〔(3 1 3 -1 1 2 )÷1 2 9 〕
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(1)( + )×45, = ×45+ ×45, =30+6, =36;
(2) × + ×0.8-0.8, = × + ×2× -2× , = ×( + -2), = ×(- ), =- ;
(3)0.25× ×4×1.6, =(0.25×4)×( ×1.6), =1×1, =1;
(4)(1 +2.25)÷[(3 -1 )÷1 ], =(1.5+2.25)÷[ × ], =3.75÷ , =3.75× , =2.5. |
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