看谁算得巧.①75.5-8.25-12.75②920÷[32×(0.5+45)]③43-43×0.9④815÷16-715×6.-数学
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答案
①75.5-8.25-12.75 =75.5-(8.25+12.75), =75.5-21, =54.5; ②
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③43-43×0.9, =(1-0.9)×43, =0.1×43, =4.3; ④
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题文
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答案
①75.5-8.25-12.75 =75.5-(8.25+12.75), =75.5-21, =54.5; ②
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③43-43×0.9, =(1-0.9)×43, =0.1×43, =4.3; ④
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