初一的有理数的加减混合运算1.33.1-(-22.9)+(-10.5)2.(-8)-(-15)+(-9)-(-12)3.-2/3+(-1/6)-(-1/4)-1/24.3/5-3/2+(-11/4)+13/4

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初一的有理数的加减混合运算1.33.1-(-22.9)+(-10.5)2.(-8)-(-15)+(-9)-(-12)3.-2/3+(-1/6)-(-1/4)-1/24.3/5-3/2+(-11/4)+

初一的有理数的加减混合运算1.33.1-(-22.9)+(-10.5)2.(-8)-(-15)+(-9)-(-12)3.-2/3+(-1/6)-(-1/4)-1/24.3/5-3/2+(-11/4)+13/4
初一的有理数的加减混合运算
1.33.1-(-22.9)+(-10.5)
2.(-8)-(-15)+(-9)-(-12)
3.-2/3+(-1/6)-(-1/4)-1/2
4.3/5-3/2+(-11/4)+13/4

初一的有理数的加减混合运算1.33.1-(-22.9)+(-10.5)2.(-8)-(-15)+(-9)-(-12)3.-2/3+(-1/6)-(-1/4)-1/24.3/5-3/2+(-11/4)+13/4
1.
原式=33.1+22.9-10.5
=56-10.5
=45.5
2.
原式=-8+15-9+12
=7-9+12
=-2+12
=10
3.
原式=-2/3-1/6+1/4-1/2
=(-2*4-2+3-6)/12
=(-8-2+3-6)/12
=-13/12
4.
原式=3/5-3/2-11/4+13/4
=(3*4-3*10-11*5+13*5)/20
=(12-30-55+65)/20
=(-18+10)/20
=-8/20
=-2/5

1,45.5
2,10
3,7/12
4,-2/5