六年级数学题脱式计算 7/13-(7/13-3/7) 1/13+12/13×(2.5
六年级数学题脱式计算 7/13-(7/13-3/7) 1/13+12/13×(2.5
(1)7/13-(7/13-3/7)
解:=7/13-7/13+3/7
=3/7
(2)1/13+12/13*(2.5-1/3)
解:=1/13+1/13[12*(2.5-1/3)]
=1/13+1/13[30-4]
=1/13*(1+30-4)
=1/13*27
=27/13
(3)(5/6-4/9)×(0.25+5/7)
解:=18×(5/6-4/9)×28×(0.25+5/7)/(28×18)
=(15-8)×(7+20)/(28×18)
=3/8
13又7/13-(4又1/4+3又7/13)-0.75简算
13又7/13-(4又1/4+3又7/13)-0.75
=13又7/13-4又1/4-3又7/13-0.75
=(13+7/13-3-7/13)-(4+1/4+3/4)
=10-5
=5;
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简算:13又7/13-(4又1/4+3又7/13)-0.75
13又7/13-(4又1/4+3又7/13)-0.75
=13又7/13-4又1/4-3又7/13-3/4
=(13又7/13-3又7/13)-(4又1/4+3/4)
=10-5
=5
数学题:7/10除以13+12/13x7/10简便演算法
解:
7/10÷13+12/13x7/10
=7/10x1/13+7/10x12/13
=7/10x(1/13+12/13)
=7/10x1
=7/10
(3/4+1/4÷3/10)x12
=3/4x12+1/4x12÷3/10
=9+3x10/3
=9+10
=19
(5/8+37.5%)÷(21/10-209%)
=(5/8+3/8)÷(2.1-2.09)
=1÷0.01
=100
六年级数学题脱式计算 3318+312÷24×205 7/3÷[(3/5-1/15)×3/4]
=3318+13*205
=3318+2665
=5983
=7/3÷2/3
=7/2
=3/4X3/4
=9/16
7/8*12/13+(7/8)/13。计算
7/8*12/13+(7/8)/13
=7/8*12/13+(7/8)*1/13
=7/8*(12/13+1/13)
=7/8
1/13+12/13*(2.5-1/3) 计算
1/13+12/13*(2.5-1/3)
=1/13×[1+12*(2.5-1/3)]
=1/13×[1+30-4]
=1/13×27
=27/13
13又7/13-(4又1/2+3又7/13)-0.75怎样简便运算
13又7/13-(4又1/2+3又7/13)-0.75
=13又7/13-3又7/13-(4.5+0.75)
=10-5.25
=4.75
计算:7/13*5/9+4/13*7/9
因为4/13*7/9=4/9*7/13 所以原式=(5/9+4/9)*7/13=7/13.
六年级数学题:7/8×4/5+7/8(简算)
7/8×4/5+7/8
=7/8(4/5+1)
=7/8×9/5
=63/40
=1又23/40