学而思初一暑期有理数的混合运算.
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学而思初一暑期有理数的混合运算.
一.(1)-5 又17/37-[(-9.5)+4又3/74]+7.5
二.-5.5+(-3.2)-(-2.5)-(-4.8)
三.(+4)÷2/3×3/2÷(-1/4)
一.(1)-5 又17/37-[(-9.5)+4又3/74]+7.5
二.-5.5+(-3.2)-(-2.5)-(-4.8)
三.(+4)÷2/3×3/2÷(-1/4)
![学而思初一暑期有理数的混合运算.](/uploads/image/z/16049396-20-6.jpg?t=%E5%AD%A6%E8%80%8C%E6%80%9D%E5%88%9D%E4%B8%80%E6%9A%91%E6%9C%9F%E6%9C%89%E7%90%86%E6%95%B0%E7%9A%84%E6%B7%B7%E5%90%88%E8%BF%90%E7%AE%97.)
(1)、-5 又17/37-[(-9.5)+4又3/74]+7.5
=-5 又17/37-(-9.5)-4又3/74+7.5
=-5 又17/37+9.5-4又3/74+7.5
=(9.5+7.5)-5 又17/37-4又3/74
=17-5 又17/37-4又3/74
(2)、-5.5+(-3.2)-(-2.5)-(-4.8)
=-5.5-3.2+2.5+4.8
=(4.8-3.2)+(2.5-5.5)
=1.6-3
=-1.4
(3)、(+4)÷2/3×3/2÷(-1/4)
=4×3/2×3/2×(-4)
=-36
=-5 又17/37-(-9.5)-4又3/74+7.5
=-5 又17/37+9.5-4又3/74+7.5
=(9.5+7.5)-5 又17/37-4又3/74
=17-5 又17/37-4又3/74
(2)、-5.5+(-3.2)-(-2.5)-(-4.8)
=-5.5-3.2+2.5+4.8
=(4.8-3.2)+(2.5-5.5)
=1.6-3
=-1.4
(3)、(+4)÷2/3×3/2÷(-1/4)
=4×3/2×3/2×(-4)
=-36