计算. (l)−43÷(−2)2×1/5; (2)−1.53×0.75+0.53×3/4−3.4×0.75; (3)−(1−0.5)÷1/3×[2+(−4)2]; (4)(−5)3×(−3/5)+32÷(−22)×(−11/4).
问题描述:
计算.
(l)−43÷(−2)2×
;1 5
(2)−1.53×0.75+0.53×
−3.4×0.75;3 4
(3)−(1−0.5)÷
×[2+(−4)2];1 3
(4)(−5)3×(−
)+32÷(−22)×(−13 5
). 1 4
答
(1)原式=-64×
×1 4
=-1 5
;16 5
(2)原式=0.75×(-1.53+0.53-3.4)=3.3;
(3)原式=-
×3×18=-27;1 2
(4)原式=75+32×(-
)×(-1 4
)=75+10=85.5 4