题目内容
计算:
①(-49)-(+91)-(-5)+(-9);
②(-
)×(-4)2-0.25×(-5)×(-4)3;
③(-48)÷6-(-25)×4
④5a2-[a2+(5a2-2a)-2(a2-3a)].
①(-49)-(+91)-(-5)+(-9);
②(-
5 |
8 |
③(-48)÷6-(-25)×4
④5a2-[a2+(5a2-2a)-2(a2-3a)].
①(-49)-(+91)-(-5)+(-9)=-49-91+5-9=-144;
②(-
)×(-4)2-0.25×(-5)×(-4)3=(-
)×16 -0.25×(-5)×(-64)=-10-80=-90;
③(-48)÷6-(-25)×4=-8+100=92;
④5a2-[a2+(5a2-2a)-2(a2-3a)]=5a2-[a2+5a2-2a-2a2+6a]=5a2-a2-5a2+2a+2a2-6a=a2-4;
②(-
5 |
8 |
5 |
8 |
③(-48)÷6-(-25)×4=-8+100=92;
④5a2-[a2+(5a2-2a)-2(a2-3a)]=5a2-[a2+5a2-2a-2a2+6a]=5a2-a2-5a2+2a+2a2-6a=a2-4;
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