题目内容
计算题:(1)-3-(-4)+7;
(2)8×(
)÷|-16|;
(3)
×(-24);
(4)(-2)2-|-6|+2-3×(
);
(5)(
)+2×(-0.5)2+32÷(-3);
(6) -32-[-5-0.2÷
×(-2)2]。
(2)8×(
(3)
(4)(-2)2-|-6|+2-3×(
(5)(
(6) -32-[-5-0.2÷
解:(1)-3-(-4)+7=-3+4+7
=(-3)+(4+7)=(-3)+11=+(11-3)=8;
(2)原式=
=
=-8
=
;
(3)原式=
=-9+4+18=(-9)+(4+18)
=(-9)+22=+(22-9)=13;
(4)原式=4-6+2+1=(4+2+1)-6=7-6=1;
(5)原式=(
)+2×0.25+9÷(-3)
=(
)+0.5+(-3)
=[(-0.5)+0.5]+(-3)
=0+(-3)
=-3;
(6)原式=-9-[-5-
×4]
=-9-(-5-1)
=-9-[(-5)+(-1)]
=-9-(-6)=-9+6
=-(9-6)=-3。
=(-3)+(4+7)=(-3)+11=+(11-3)=8;
(2)原式=
=
=-8
(3)原式=
=-9+4+18=(-9)+(4+18)
=(-9)+22=+(22-9)=13;
(4)原式=4-6+2+1=(4+2+1)-6=7-6=1;
(5)原式=(
=(
=[(-0.5)+0.5]+(-3)
=0+(-3)
=-3;
(6)原式=-9-[-5-
=-9-(-5-1)
=-9-[(-5)+(-1)]
=-9-(-6)=-9+6
=-(9-6)=-3。
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