求简便运算,要过程。(能简便的要简便)
7/8-1/4+5/122-(1-3/7+4/7)0.27×7.2-2.7×0.71﹙9.9+0.1-9.9+0.1﹚÷0.01解方程。x-5/8=3/85/12+x=7...
7/8-1/4+5/12
2-(1-3/7+4/7)
0.27×7.2-2.7×0.71
﹙9.9+0.1-9.9+0.1﹚÷0.01
解方程。
x-5/8=3/8
5/12+x=7/9
x-3/8+1/9=4/9
口算
1/6-1/7=
3/4+0.5= 展开
2-(1-3/7+4/7)
0.27×7.2-2.7×0.71
﹙9.9+0.1-9.9+0.1﹚÷0.01
解方程。
x-5/8=3/8
5/12+x=7/9
x-3/8+1/9=4/9
口算
1/6-1/7=
3/4+0.5= 展开
3个回答
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解:培数判(1)7/8-1/4+5/12
=21/24-6/24+10/24
=25/24
(2)2-(1-3/7+4/7)
=2-1+3/7-4/7
=1-1/7
=6/7
(3)0.27×7.2-2.7×0.71
=2.7×0.1×7.2-2.7×0.71
=2.7×(0.72-0.71)
=2.7×0.01
=0.027
(4)﹙9.9+0.1-9.9+0.1﹚÷0.01
=0.2÷0.01
=20
(5)x-5/8=3/8
x=3/8+5/8
x=1
(6)5/12+x=7/9
x=7/9-5/12
x=28/36-15/36
x=13/36
(7)x-3/8+1/9=4/9
x=4/9-1/9+3/8
x=1/3+3/8
x=8/24+9/24
x=17/24
(8) 1/6-配改1/7=1/42
(9) 3/4+毕祥0.5=5/4
=21/24-6/24+10/24
=25/24
(2)2-(1-3/7+4/7)
=2-1+3/7-4/7
=1-1/7
=6/7
(3)0.27×7.2-2.7×0.71
=2.7×0.1×7.2-2.7×0.71
=2.7×(0.72-0.71)
=2.7×0.01
=0.027
(4)﹙9.9+0.1-9.9+0.1﹚÷0.01
=0.2÷0.01
=20
(5)x-5/8=3/8
x=3/8+5/8
x=1
(6)5/12+x=7/9
x=7/9-5/12
x=28/36-15/36
x=13/36
(7)x-3/8+1/9=4/9
x=4/9-1/9+3/8
x=1/3+3/8
x=8/24+9/24
x=17/24
(8) 1/6-配改1/7=1/42
(9) 3/4+毕祥0.5=5/4
展开全部
7/8-1/4+5/12=21/24-6/24+10/24=21-6+10/24=25/24
2-(1-3/7+4/7)=2-(7/7-3/7+4/7)=2-(7-3+4/旅悉7)=2-8/7=14/拆嫌乎7-8/7=14-8/7=6/7
0.27×7.2-2.7×0.71=2.7×0.1×7.2-2.7×0.71=2.7×0.72-2.7×0.71=2.7×(0.72-0.71)=2.7×0.01=0.027
﹙9.9+0.1-9.9+0.1﹚÷0.01=﹙9.9-9.9+0.1+0.1﹚者链÷0.01=0.2÷0.01=20
2-(1-3/7+4/7)=2-(7/7-3/7+4/7)=2-(7-3+4/旅悉7)=2-8/7=14/拆嫌乎7-8/7=14-8/7=6/7
0.27×7.2-2.7×0.71=2.7×0.1×7.2-2.7×0.71=2.7×0.72-2.7×0.71=2.7×(0.72-0.71)=2.7×0.01=0.027
﹙9.9+0.1-9.9+0.1﹚÷0.01=﹙9.9-9.9+0.1+0.1﹚者链÷0.01=0.2÷0.01=20
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