(7/12-3/7)-(4/7-7/12)5/7+19/25*4+21/25*19943/73*67+69*26/73
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(7/12-3/7)-(4/7-7/12)5/7+19/25*4+21/25*19943/73*67+69*26/73
(7/12-3/7)-(4/7-7/12)
5/7+19/25*4+21/25*199
43/73*67+69*26/73
(7/12-3/7)-(4/7-7/12)5/7+19/25*4+21/25*19943/73*67+69*26/73
7/12-3/7)-(4/7-7/12)=7/12+7/12-3/7-4/7=14/12-1=2/12=1/6
5/7+19/25*4+21/25*199=5/7+(1-6/25)x4+(1-4/25)x199
=5/7+4-24/25+199-4x(200-1)/25
=5/7+203-24/25-32+4/25
=171+5/7-4/5
=171+25/35-28/35
=171-3/35
=5982/35
43/73*67+69*26/73
=(43x67+69x26)/73
=(2881+1794)/73
=4675/73
简便计算:(5/12-3/7)-(4/7-7/12) =简便计算:(5/12-3/7)-(4/7-7/12)===
(4/7-8/7-12/7)/(-8/7)+(-3/8)
5/2÷[3/7×(4/3+7/12)]
(12分之5-7分之3)-(7分之4-12分之7)简便运算
(5/12-3/7)-(4/7-7/12)简便方法
用简便方法解:(5/12-3/7)—(4/7-7/12)
(7/4-7/8-7/12)/(-7/8)+(-8/3)=(要过程)
习题3,4,7,12,(),28
用简便方法做(12/5-7/3)-(7/4-12/7)=
(1又3/4-7/8-7/12)/(-7/8)
能简算的要简算 (3)11/12×5/7+11/12×2/7 (4)7/8×15+7/8(3)11/12×5/7+11/12×2/7(4)7/8×15+7/8
阅读下面的解题过程:(-7/8)/(1又3/4-7/8-7/12)=(-7/8)/1又3/4-(-7/8/7/8-(-7/8)/7/12/7/12=-7/8*4/7+7/8*8/7+7/8*12/7=-1/2+1+3/2=2上述解题过程对不对,如果不对,
(1 3/4-7/8-7/12)/(-7/8)+(-7/8)/(1 3/4-7/8-7/12)
(1又3/4-7/8-7/12)除以(-7/8)+(-2/3)
(1又3/4-7/8-7/12)/(-7/8)+(-8/3)
(-15)/(1/3-3/2-3)x6(-7/8)/(7/4-7/8-7/12)
4/7 X- 12 :3/7 X+12 = 2 :
(1又3/4+7/8-7/12)×(-1又1/7)