1楼:才友楣
(1)2400÷80-14×2,
=30-28,
=2;(2)108-(83+360÷60),=108-(83+6),
=108-89,
=19;
(3)(420+48)÷(375-339),=468÷36,
=13;
(4)420÷[(205-198)×4],=420÷[7×4],
=420÷28,
=15;
(5)460÷(29-18÷3),
=460÷(29-6),
=460÷23,
=20;
(6)1450÷[2×(16+9)],
=1450÷[2×25],
=1450÷50,
=29.
2400÷80-14×5脱式计算
2楼:王奕世
=30-70
=-40
用递等式计算,能简算的要简算.135÷27+12×4 1620-1320÷60+80 (85+14×5)÷5 520÷[13×(43-33)]
3楼:果子的粉丝
(1)135÷27+12×4,
=5+48,
=53;
(2)1620-1320÷60+80,
=1620-22+80,
=1598+80,
=1678;
(3)(85+14×5)÷5,
=(85+70)÷5,
=155÷5,
=31;
(4)520÷[13×(43-33)],
=520÷[13×10],
=520÷130,
=4;(5)490÷[210÷(360÷12)],=490÷[210÷30],
=490÷7,
=70;
(6)[160-(75+38)]×107,=[160-113]×107,
=47×107,
=5029;
(7)45+61+39+55,
=(45+55)+(61+39),
=100+100,
=200;
(8)25×5×4×2,
=(25×4)×(5×2),
=100×10,
=1000;
(9)125×(8×5)×7,
=(125×8)×(5×7),
=1000×35,
=35000.
脱式计算.105×4×5 45÷5×80 地下+44×8 (地00+80)×4 100-地3×3 14×下-地
4楼:小二
(1)10左×d×左
=10左×(d×左)
=10左×下0
=下100;
(下)d左÷左×80
=2×80
=7下0;
(3)下6+dd×8
=下6+3左下
=378;
(d)(下00+80)×d
=下00×d+80×d
=800+3下0
=11下0;
(左)100-下3×3
=100-62
=31;
(6)1d×6-下8
=8d-下8
=左6.
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