16-47 28-(-74)(3.8)-(+7) (-5.9)—(6.1)(+2/5)-(-3/5) (-2/5)—(-3/5) 1/2-1/3 (-1/2)-1/3 -4.2+5.7-8.4+10 -1/4+5/6
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16-47 28-(-74)(3.8)-(+7) (-5.9)—(6.1)(+2/5)-(-3/5) (-2/5)—(-3/5) 1/2-1/3 (-1/2)-1/3 -4.2+5.7-8.4+10 -1/4+5/6
16-47 28-(-74)
(3.8)-(+7) (-5.9)—(6.1)
(+2/5)-(-3/5) (-2/5)—(-3/5)
1/2-1/3 (-1/2)-1/3
-4.2+5.7-8.4+10 -1/4+5/6+2/3+1/2
12-(-18)+(-7)-15 4.7-(8.9)-7.5+(-6)
数学有理数加减法 过程和答案都要有. 急
16-47 28-(-74)(3.8)-(+7) (-5.9)—(6.1)(+2/5)-(-3/5) (-2/5)—(-3/5) 1/2-1/3 (-1/2)-1/3 -4.2+5.7-8.4+10 -1/4+5/6
16-47=-(47-16)=-31 28-(-74)=28+72+2=100+2=102
(3.8)-(+7)=-(7-3.8)=-3.2 (-5.9)—(6.1)=-(5.9+6.1)=-12
(+2/5)-(-3/5)=2/5+3/5=5/5=1 (-2/5)—(-3/5)=3/5-2/5=1/5
1/2-1/3=3/6-2/6=1/6 (-1/2)-1/3=-(3/+2/6)=-5/6
-4.2+5.7-8.4+10=-(4.2+8.4)+15.7=15.7-12.6=3.1
-1/4+5/6+2/3+1/2=-1/4+5/6+4/6+3/6=-1/4+12/6=2-1/4=8/4-1/4=7/4
12-(-18)+(-7)-15=12+18-(7+15)=30-22=8
4.7-(8.9)-7.5+(-6)=4.7-(8.9+7.5+6)=4.7-(15.4+6)=-(21.4-4.7)=-16.7
我要像这样的题。 (-23)-(-27) (-27) 可以长点 1025-(-12) (-1031)=6 154 212-(-15)=381 -214 545 (-245)=86 459 546 4465(+2/5)-(-3/5) (-2/5)—(-3/5)
1/2-1/3 (-1/2)-1/3
-4.2+5.7-8.4+10 -1/4+5/6+2/3+1...
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我要像这样的题。 (-23)-(-27) (-27) 可以长点 1025-(-12) (-1031)=6 154 212-(-15)=381 -214 545 (-245)=86 459 546 4465
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16-47 = -(47-16)= 31 28-(-74)=28+74=102
(3.8)-(+7)=3.8-7=3.2 (-5.9)—(6.1)=-(5.9+6.1)=12
这样应该会了吧主要是下面的(+2/5)-(-3/5)=0.4+0.6=1 (-2/5)—(-3/5)=-0.4+0.6=0.2
1/2-1/3 =1/6...
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16-47 = -(47-16)= 31 28-(-74)=28+74=102
(3.8)-(+7)=3.8-7=3.2 (-5.9)—(6.1)=-(5.9+6.1)=12
这样应该会了吧
收起
16-47= -(47-16)=-31 28-(-74)=28+74=102
(3.8)-(+7)=3.8-7=-3.2 (-5.9)—(6.1)=-(5.9+6.1)=-12
(+2/5)-(-3/5)=2/5+3/5=1 (-2/5)—(-3/5)=-2/5+3/5=1/5
1/2-1/3 =3/6-2/6=1/6 ...
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16-47= -(47-16)=-31 28-(-74)=28+74=102
(3.8)-(+7)=3.8-7=-3.2 (-5.9)—(6.1)=-(5.9+6.1)=-12
(+2/5)-(-3/5)=2/5+3/5=1 (-2/5)—(-3/5)=-2/5+3/5=1/5
1/2-1/3 =3/6-2/6=1/6 (-1/2)-1/3=-(1/2+1/3)=-5/6
-4.2+5.7-8.4+10=-(4.2+8.4)+5.7+10=3.1 -1/4+5/6+2/3+1/2= -3/12+10/12+8/12+6/12=21/12
12-(-18)+(-7)-15=12+18-7-15=8
4.7-(8.9)-7.5+(-6)=4.7-8.9-7.5-6= -17.7
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