问题:
计算:
(1)( - + )×(-30);
(2)-1 4-[-2+(1-0.2÷ )×(-3)];
(3)(+23)× +(-57)× +(-26)× 。
计算:
(1)( - + )×(-30);
(2)-1 4-[-2+(1-0.2÷ )×(-3)];
(3)(+23)× +(-57)× +(-26)× 。
(1)( - + )×(-30);
(2)-1 4-[-2+(1-0.2÷ )×(-3)];
(3)(+23)× +(-57)× +(-26)× 。
参考答案: