Ⅰ 301x12簡便計算怎麼做
301x12簡便計算
=(300+1)*12
=300*12+1*12
=3600+12
=3612
Ⅱ 找出十道能用簡便方法計算的小數乘法並且有答案
(1)2.64×1.7-2.64×0.7
=2.64×(1.7-0.7)
=2.64×1
=2.64
(2)31.5×1.07-3.15×0.7
=3.15×10.7-3.15×0.7
=3.15×(10.7-0.7)
=3.15×10
=31.5
(3)2.7×5.7-2.7+5.3×2.7
=2.7×(5.7-1+5.3)
=2.7×10
=27
(4)0.625÷0.125×0.8
=(0.625×0.8)×8÷(0.128×8)
=0.5×8÷1
=4
(5)18.6×6.1+3.9×18.6
=18.6×(6.1+3.9)
=18.6×10
=186
(6)1.3579+3.5791+5.7913+7.9135+9.1357
=(1+3+5+7+9)×1.1111
=25×1.1111
=27.7775
(7)52.5x2.9+5.45
=5.25x29+5.25+0.2
=5.25×(29+1)+0.2
=5.25×30+0.2
=157.5+0.3
=157.7
(8)0.92x15+0.08x15
=(0.92+0.08)×15
=1×15
=15
(9)0.72×1.25×2.5
=0.9×(0.8×1.25)×2.5
=0.9×1×2.5
=2.25
(10)400.6x7-2003x0.4
=200.3x14-200.3x4
=200.3×(14-4)
=200.3×10
=2003
Ⅲ 33x62+40x33-33x2的簡便運算方法
這道題是可以進行簡便運算的。首先現在後面的兩個,把33提出來以後,就變成了33×(40-2)=33×38。然後再與前面的進行計算,帶把33提取出來,就變成了33×(62+38)=33×100=3300。
Ⅳ 888x24十444x52的簡便運算方法
=888×24+888×26
=888×(24+26)
=888×50
=44400
解法分析:提取公因數888,利用乘法分配律逆用,按照四則運演算法則進行運算,同級運算按順序計算,不同級運算先算高級運算,所以就可以很快得出結果。