怎样算简便就怎样算.①46×8-120÷15②49×67+49÷7③6.28+7.13-(5.13+3.28)④23+(45-23)×53⑤(12.5×8-40)÷0.6⑥(512-19+38)×72.-数学
题文
怎样算简便就怎样算. ①46×8-120÷15 ②
③6.28+7.13-(5.13+3.28) ④
⑤(12.5×8-40)÷0.6 ⑥(
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答案
①46×8-120÷15, =368-8, =360; ②
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=1×
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③6.28+7.13-(5.13+3.28), =6.28+7.13-5.13-3.28, =(6.28-3.28)+(7.13-5.13), =3+2, =5; ④
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