脱式计算(③④⑤小题用简便方法).①635+9030÷86×13②4.1-2.56÷(0.18+0.62)③45×101④5.7-(1.9-1.3)⑤9899+9899×98⑥45÷〔58×(16+13)〕-六年级数学
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答案
①635+9030÷86×13, =635+105×13, =635+1365, =2000; ②4.1-2.56÷(0.18+0.62), =4.1-2.56÷0.8, =4.1-3.2, =0.9; ③45×101, =45×(100+1), =4500+45, =4545; ④5.7-(1.9-1.3), =5.7-1.9+1.3, =5.7+1.3-1.9, =7-1.9, =5.1; ⑤
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=98; ⑥
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=2
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