几道初一计算题3×(-9)+7×(-9)(5/4-7/6)×(-8/7)(-54)/6/(-3)2×〔5+(-2)³〕-(2/13-1/3-1/6)×78

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几道初一计算题3×(-9)+7×(-9)(5/4-7/6)×(-8/7)(-54)/6/(-3)2×〔5+(-2)³〕-(2/13-1/3-1/6)×78

几道初一计算题3×(-9)+7×(-9)(5/4-7/6)×(-8/7)(-54)/6/(-3)2×〔5+(-2)³〕-(2/13-1/3-1/6)×78
几道初一计算题
3×(-9)+7×(-9)
(5/4-7/6)×(-8/7)
(-54)/6/(-3)
2×〔5+(-2)³〕
-(2/13-1/3-1/6)×78

几道初一计算题3×(-9)+7×(-9)(5/4-7/6)×(-8/7)(-54)/6/(-3)2×〔5+(-2)³〕-(2/13-1/3-1/6)×78
①原式=(-9)×(3+7)=(-9)×10=-90
②原式=(5/4)×(-8/7)+(7/6)×(8/7)=-10/7+4/3=-2/21
③原式=(-54)×(1/6)×(-1/3)=-9×(-1/3)=3
④原式=2×(5-8)=-6
⑤原式=-〔(2/13)×78-(1/3)×78-(1/6)×78〕=-(12-26-13)=-(-27)=27

3×(-9)+7×(-9)=(-9)*(3+7)=-90
(5/4-7/6)×(-8/7)=(5/4)*(-8/7)+(7/6)*(8/7)=-10/7+4/3=-2/21
(-54)/6/(-3)=(-9)/(-3)=3
2×〔5+(-2)³〕=2*(5-8)=-6
-(2/13-1/3-1/6)×78=-2*78/13+78/3+78/6=-12+26+13=27