题目内容
计算题:
(1)0.5-(+3
)+3.75-(+7
)
(2) (-7)×(-5)-90÷(-3)
(3)
(4)
(5)3+60÷22×(-
)-1
(6)(3-7)2-6÷(-2)×(-
)
(7)
(1)0.5-(+3
(2) (-7)×(-5)-90÷(-3)
(3)
(4)
(5)3+60÷22×(-
(6)(3-7)2-6÷(-2)×(-
(7)
解:(1)0.5-(+3
)+3.75-(+7
)=0.5-3
+3.75-7
=-7;
(2)(-7)×(-5)-90÷(-3)=35+30=65;
(3)原式=-8×(
)=-8×(-
)=
;
(4)原式=-12×
+12×
-12×
=-16+9-10=-17;
(5)原式=3+60÷4×(-
)-1=3-3-1=-1;
(6)原式=(-4)2-6×
=16-1=15;
(7)原式=27×
×
+0.2=
+0.2=2.
(2)(-7)×(-5)-90÷(-3)=35+30=65;
(3)原式=-8×(
(4)原式=-12×
(5)原式=3+60÷4×(-
(6)原式=(-4)2-6×
(7)原式=27×
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