-2.1×6.5×(-7/3)要过程
-2.1×6.5×(-7/3)要过程
-2.1×6.5×(-7/3)
=3x0.7x6.5x7/3
=4.9x6.5
=31.85
(-6.5)-(-17/4)十35/4-( 7/2) 5=?要过程
(-6.5)-(-17/4)十35/4-( 7/2) 5
A、换算成分式计算
先确定符号与去括号
=-6.5+17/4+35/4- 35/2
再写成分母全为4的分式(或小数)
=-6.5×4/4+17/4+35/4- 35×2/4
计算
=-26/4+17/4+35/4- 70/4
合并
=(-26+17+35-70)/4
计算
=(-26+17+35-70)/4
=-44/4
=-11
B、换算成小数计算
先确定符号与去括号
=-6.5+17/4+35/4- 35/2
全换算成小数
=-6.5+4.25+8.75- 17.5
合并(按最方便计算)
=(4.25+8.75)-(17.5+6.5)
计算
=13-24
=11
希望能帮上你
7/3X:(7/4-72)=5:4 整么解?要过程,
解28/3x=5*(-70.25) 28/3x=-351.25 x=-4215/112
7/11+7/11*20%+7/11*80%(要过程)
7/11+7/11*20%+7/11*80%
= 7/11 * (1 + 20% + 80%)
= 7/11 * 2
= 14/11
2又7/9÷(-2又7/9)(要过程)
2又7/9÷(-2又7/9)
= -2又7/9÷2又7/9
= -1
-7×【-7/22】+26×(-7/22)-2×7/22=? 要过程谢谢
原式=-7/22*(-7+26+2)
=-7/22*21
=-147/22
=-6又22分之15
7/2:7/8化简要过程的
7/12:7/8=14/24:21/24=14:21=2:3
要过程 【2/3+(4/7-1/2)】*7/25
【2/3+(4/7-1/2)】*7/25
=【2/3+(8/14-7/14)】*7/25
=【2/3+1/14】*7/25
=【28/42+3/42】*7/25
=(31/42)*(7/25)
=(31/6)*(1/25)
=31/150
3/2x-7=7/2x+42 要过程
3/2x-7=7/2x+42
3/2x-7/2x=42+7
-2x=49
x=- 49/2
注意是负二分之四十九
7/12×1/7+5/12÷7 要过程
=7/12×1/7+5/12×1/7
=(7/12+5/12)×1/7
=1×1/7
=1/7