早教吧作业答案频道 -->数学-->
用简便方法计算下列各题.(1)372÷162×54(2)132×288÷(24×11)(3)616÷36×18÷22(4)14×44×104(5)8100÷5÷90×15(6)7777×3333÷1111(7)(4+7+…+25+28)-(2+5+…+23+26)(8)19
题目详情
用简便方法计算下列各题.
(1)372÷162×54 | (2)132×288÷(24×11) | (3)616÷36×18÷22 |
(4)14×44×104 | (5)8100÷5÷90×15 | (6)7777×3333÷1111 |
(7)(4+7+…+25+28)-(2+5+…+23+26) | (8)199+1999+19999+199999. |
▼优质解答
答案和解析
(1)372÷162×54,
=372÷(162÷54),
=372÷3,
=124;
(2)132×288÷(24×11),
=132×288÷24÷11,
=132÷11×288÷24,
=(132÷11)×(288÷24),
=12×12,
=144;
(3)616÷36×18÷22,
=616×18÷36÷22,
=14;
(4)14×44×104,
=2×7×4×11×8×13,
=(7×11×13)×(2×4×8),
=1001×64,
=64064;
(5)8100÷5÷90×15,
=8100×15÷5÷90,
=(8100×15)÷(5×90),
=121500÷450,
=270;
(6)7777×3333÷1111,
=1111×7×1111×3÷1111,
=7×3×1111×1111÷1111,
=(7×3)×1111×(1111÷1111),
=21×1111×1,
=23331;
(7)(4+7+…+25+28)-(2+5+…+23+26),
=4+7+…+25+28-2-5-…-23-26,
=(4-2)+(7-5)+…+(25-23)+(28-26),
=2+2+…2+2,
=2×9,
=18;
(8)199+1999+19999+199999,
=200-1+2000-1+20000-1+200000-1,
=(200+2000+20000+200000)-(1+1+1+1),
=222200-4,
=222196.
=372÷(162÷54),
=372÷3,
=124;
(2)132×288÷(24×11),
=132×288÷24÷11,
=132÷11×288÷24,
=(132÷11)×(288÷24),
=12×12,
=144;
(3)616÷36×18÷22,
=616×18÷36÷22,
=14;
(4)14×44×104,
=2×7×4×11×8×13,
=(7×11×13)×(2×4×8),
=1001×64,
=64064;
(5)8100÷5÷90×15,
=8100×15÷5÷90,
=(8100×15)÷(5×90),
=121500÷450,
=270;
(6)7777×3333÷1111,
=1111×7×1111×3÷1111,
=7×3×1111×1111÷1111,
=(7×3)×1111×(1111÷1111),
=21×1111×1,
=23331;
(7)(4+7+…+25+28)-(2+5+…+23+26),
=4+7+…+25+28-2-5-…-23-26,
=(4-2)+(7-5)+…+(25-23)+(28-26),
=2+2+…2+2,
=2×9,
=18;
(8)199+1999+19999+199999,
=200-1+2000-1+20000-1+200000-1,
=(200+2000+20000+200000)-(1+1+1+1),
=222200-4,
=222196.
看了 用简便方法计算下列各题.(1...的网友还看了以下:
用简便方法计算1.25×5.7×83.2÷5÷0.21.8×25+12×2.5. 2020-05-15 …
数学分数简便计算,11/24*16 1/4*2/7 6/12*6+5/12*6 3/5*5/6 5 2020-05-16 …
概率论与数理统计邮政大厅有5个邮筒,现将2封信逐一随机投入邮筒,求(1)第一个邮筒内恰好有1封信的 2020-06-15 …
脱式计算(有简的就简便)3.3×3/4+0.75×5.7+75%(2/3+1/2)×6/7一5脱式 2020-07-17 …
(2012•南康市模拟)直接写出得数:24.06+0.4=38−13=(56−15)×30=45× 2020-07-18 …
简便计算①86+86×99②289×98③125×4×8×25×5×2④199+1999+1999 2020-07-19 …
计算题,注意运用简便运算.2.36+25.82+77.64-15.8222.8×98+45.64. 2020-07-19 …
8.25与2.25的差减区什么数得2/7? 2020-07-29 …
(2012•潍坊模拟)直接写得数8.2+0.54+0.46=2.8×25+12×2.5=35÷60% 2020-11-13 …
(2007•河池)直接写出得数100-52=1.75+1.5=12+13=35−12=8×25=4. 2020-11-13 …