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计算:(1)-20+(+3)-(-5)-(+7);(2)(-18)÷214×49÷(-16);(3)42×(-23)+(-34)÷(-0.25);(4)(-7)×(-5)-90÷(-15);(5)-3.14×35+6.28×(-23.3)-15.7×3.68;(6)[11×2-|3÷3|-(-3

题目详情
计算:
(1)-20+(+3)-(-5)-(+7);
(2)(-18)÷2
1
4
×
4
9
÷(-16);
(3)42×(-
2
3
)+(-
3
4
)÷(-0.25);
(4)(-7)×(-5)-90÷(-15);
(5)-3.14×35+6.28×(-23.3)-15.7×3.68;
(6)[11×2-|3÷3|-(-3)2-33
3
4
▼优质解答
答案和解析
(1)原式=-20+3+5-7=-27+8=-19;
(2)原式=18×
4
9
×
4
9
×
1
16
=
2
9

(3)原式=-28+3=-25;
(4)原式=35+6=41;
(5)原式=-3.14×35+3.14×(-46.6)-5×3.14×3.68=3.14×(-35-46.6-18.4)=-314;
(6)原式=(22-1-9-27)×
4
3
=-15×
4
3
=-20.