1.(-10)+8x(-2)²-(-4)x(-3) 2.(-2/3+3/4-5/6)x(-12) 3.(-1/2)+3又1/4+2.75+(-6又1/2)4.1/3+(-3/4)+(-1/3)+(-1/4)+18/19 5.{-3-(-7)+(-3)}x[-1又3/4÷3又1/2x(-10又1/2)]-56.-4/5x[(-1/2)÷(0.75-1)+(-2)] 7.

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1.(-10)+8x(-2)²-(-4)x(-3)2.(-2/3+3/4-5/6)x(-12)3.(-1/2)+3又1/4+2.75+(-6又1/2)4.1/3+(-3/4)+(-1/3)+

1.(-10)+8x(-2)²-(-4)x(-3) 2.(-2/3+3/4-5/6)x(-12) 3.(-1/2)+3又1/4+2.75+(-6又1/2)4.1/3+(-3/4)+(-1/3)+(-1/4)+18/19 5.{-3-(-7)+(-3)}x[-1又3/4÷3又1/2x(-10又1/2)]-56.-4/5x[(-1/2)÷(0.75-1)+(-2)] 7.
1.(-10)+8x(-2)²-(-4)x(-3)
=-10+32-12
=10
2.(-2/3+3/4-5/6)x(-12)
=-2/3×12+3/4×12-5/6×12
=-8+9-10
=-9
3.(-1/2)+3又1/4+2.75+(-6又1/2)
=-1/2+3+1/4+2+3/4-6-1/2
=-7+6
=-1
4.1/3+(-3/4)+(-1/3)+(-1/4)+18/19
=1/3-3/4-1/3-1/4+18/19
=-1+18/19
=-1/19
5.{-3-(-7)+(-3)}x[-1又3/4÷3又1/2x(-10又1/2)]-5
=(-3+7-3)×[(-7/4)×(2/7)×(-21/2)]-5
=1×21/4-5
=1/4
6.-4/5x[(-1/2)÷(0.75-1)+(-2)]
=-4/5×[(-1/2)÷(-1/4)-2]
=-4/5×(2-2)
=0