1樓:血刺鬼哥欄
(1)0.25×
7.8×4
=0.25×4×7.8
=7.8;
(2)30.6-40.5÷7.5
=30.6-5.4
=25.2;
(3)3.7÷2.5÷0.4
=3.7÷(2.5×0.4)
=3.7÷1
=3.7;
(4)3.5×(0.7+0.3×4)
=3.5×(0.7+1.2)
=6.65;
(5)1.38+1.38×99
=1.38×(99+1)
=1.38×100
=138;
(6)[2-(0.31+0.69)]÷0.001=[2-1]÷0.001
=1÷0.001
=1000.
0.25×0.7×0.8的簡便運算?
2樓:持酒七
0.25×0.7×0.8的簡便運算:
都是乘法,優先順序相同。
上式可寫作:
0.25×0.8×0.7
=0.2×0.7
=0.14
3樓:黎祖南
簡便計算過程方法如下
解:0.25x0.7x0.8
=0.25x4x0.2x0.7
=1x0.14
=0.14
4樓:子騰學長
0.25×0.4×2×0.7=0.1×2×0.7=0.14
5樓:陳長的路上
0.25x0.7x0.8
=0.25x4x0.2x0.7
=1x0.14
=0.14
0.25乘0.7×0點8怎樣用簡便演算法
6樓:匿名使用者
0.25乘0.7×0點8怎樣用簡便演算法
=0.25x0.8x0.7
=0.2x0.7
=0.14
7樓:匿名使用者
=0.25×0.8×0.7
=0.2×0.7
=0.14
用簡便方法計算7.8*9.9
8樓:瘸腿的傲嬌喵
7.8x9.9=7.8x(10-0.1)=7.8x10-7.8x0.1=78-0.78=77.22
希望採納
計算下面各題(能簡便的用簡便方法) 8/9+7/12+3/4 5/12+7/8-9/20 2.85+2/7+2.15+4/7 3.4-(0.25+2/5)
9樓:新野旁觀者
8/9+7/12+3/4
=32/36+21/36+27/36
=80/36
=20/9
=2又2/9
5/12+7/8-9/20
=50/120+105/120-54/120=101/120
2.85+2/7+2.15+4/7
=(2.85+2.15)+2/7+4/7
=5+6/7
=5又6/7
3.4-(0.25+2/5)
=3.4-0.4-0.25
=3-0.25
=2.75
7/8-7/27-20/27
=7/8-(7/27+20/27)
=7/8-1
=-1/8
2.15-(5/6-1/12)
=2.15-3/4
=2.15-0.75
=1.4
11/12+5/8+3/8+1/12
=(11/12+1/12)+(5/8+3/8)=1+1
=25-3/7-4/7
=5-(3/7+4/7)
=5-1
=42/5*20+3/5*20
=(2+3)/5*20
=5/5*20
=205/6-1/4+1/3
=10/12-3/12+4/12
=11/12
10樓:匿名使用者
我是無奈下發的:我是乙個叫冰楓的男孩,前
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