计算下面各题,能简算的要简算.(1)912÷57×45+180(2)57×45+27÷54(3)38.5-15.38+61.25-4.62(4)79×[34+(56-712)].-数学
题文
计算下面各题,能简算的要简算. (1)912÷57×45+180 (2)
(3)38.5-15.38+61.25-4.62 (4)
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答案
(1)912÷57×45+180, =16×45+45×4, =45×(16+4), =45×20, =900; (2)
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(3)38.5-15.38+61.25-4.62, =38.5+61.25-(15.38+4.62), =99.75-20, =79.75; (4)
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