计算下面各题,能简算的要简算.(1)912÷57×45+180(2) 5 7 × 4 5 + 2 7
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+(56-71...
计算下面各题,能简算的要简算.(1)912÷57×45+180(2) 5 7 × 4 5 + 2 7 ÷ 5 4 (3)38.5-15.38+61.25-4.62 (4) 7 9 ×[ 3 4 +( 5 6 - 7 12 )] .
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2014-11-11
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(1)912÷57×45+180, =16×45+45×4,穗返洞碰 =45×(16+4), =45×20, =900; (2) × + ÷ , = × + × , = ×( + ), = ×1, = ;猜颤饥 (3)38.5-15.38+61.25-4.62, =38.5+61.25-(15.38+4.62), =99.75-20, =79.75; (4) ×[ +( - )] , = × ( + - ), = ×( + - ), = ×1, = . |
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