问题
解答题
计算 ①23+(-37)-23+7 ②(
③-22-(-3)2×(-1)3 ④4×(-8)×25×(-1.25) ⑤4-[(-5-3)÷23]+32÷(-2)3. |
答案
①23+(-37)-23+7
=23+(-37)+(-23)+7
=(23+7)+[(-37)+(-23)]
=30+(-60)
=-(60-30)
=-30;
②(
-2 3
-1 4
)×(-24)3 8
=
×(-24)-2 3
×(-24)-1 4
×(-24)3 8
=-16-(-6)-(-9)
=-16+6+9
=-16+(6+9)
=-16+15
=-(16-15)
=-1;
③-22-(-3)2×(-1)3
=-4-9×(-1)
=-4-(-9)
=-4+9
=+(9-4)
=5;
④4×(-8)×25×(-1.25)
=4×8×25×(1.25)
=(4×25)×(8×1.25)
=100×10
=1000;
⑤4-[(-5-3)÷23]+32÷(-2)3
=4-{[(-5)+(-3)]÷8}+32÷(-8)
=4-(-8)÷8+(-4)
=4-(-1)+(-4)
=4+1+(-4)
=[4+(-4)]+1
=1.