人教版四年级数学小数笔算题两位数相加相减就行,至少要有50道哦!

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人教版四年级数学小数笔算题两位数相加相减就行,至少要有50道哦!
人教版四年级数学小数笔算题
两位数相加相减就行,至少要有50道哦!

人教版四年级数学小数笔算题两位数相加相减就行,至少要有50道哦!
51.8-43.6= 87.8-47.4= 97.1-56.8= 45.9-36.1= 67.9-35.6=
58.9+37.6= 56.4+19.9= 46.7-41.8= 99.9-64.8= 94.7+1.9=
69.3+28.5= 53.7+17.9= 37.3+21.8= 16.4+52.9= 34.1+27.7=
92.6-54.8= 67.9-31.4= 52.1-16.8= 7.5-3.6= 65.7-37.9=
3.5+4.7= 28.9+4.6= 10.0+59.6= 65.4+16.23= 39.8+55.55=
96.5-38.7= 97.8-41.6= 68.4-37.7= 79.9-43.43= 64.6-27.7=
87.9-59.9= 99.9-51.9= 74.6-2.5= 89.4-24.9= 80.1-27.5=
54.7+29.3= 78.9+1.3= 12+3.9= 5.2+30= 41+3.7=
51-3.7= 34-21.5= 58-37.4= 89-5.1= 54-20.6=
60-2.9= 65-2.1 88-0.36= 95-2.4= 61-3.1=

69+28= 53+17= 37+21= 16+52= 34+27=
12+72= 41+36= 71+23= 19+36= 24+29=
54+29= 78+13= 12+39= ...

全部展开

69+28= 53+17= 37+21= 16+52= 34+27=
12+72= 41+36= 71+23= 19+36= 24+29=
54+29= 78+13= 12+39= 52+30= 41+37=
35+47= 28+46= 10+59= 65+16= 39+55=
25+48= 36+47= 65+21= 33+66= 64+28=
87-59= 99-51= 74-25= 89-24= 80-27=
96-38= 97-41= 68-37= 79-43= 64-27=
92-54= 67-31= 52-16= 75-36= 65-37=
51-37= 34-21= 58-37= 89-51= 54-20=
60-29= 65-21 88-36= 95-24= 61-31
纯手打

收起

12+46 ,64+56, 45+65 , 48+68 ,46+18,98+49,25+46,64+28,13+36,14+38,

随便写呗
比如40+8什么的

有一泳池,开水管放满全池需要10小时,放水管放空全池需要9小时,试问放水管和开水管全部开启需要几小时放满全池?