用递等式计算,写出必要的计算过程,能简便运算的要用简便方法计算.100-870÷29-8815÷7.5+4.6-6.63.5×

2025-02-15 06:13:17
推荐回答(1个)
回答1:

①100-870÷29-88
=100-30-88
=-18

②15÷7.5+4.6-6.6
=2+4.6-6.6
=6.6-6.6
=0

③3.5×64×12.5
=(3.5×8)×(8×12.5)
=28×100
=2800

④51×7.5-49×7.5-1
=(51-49)×7.5-1
=2×7.5-1
=15-1
=14

⑤4×(4.8+3.2÷4-5.6)
=4×(4.8+0.8-5.6)
=4×0
=0


⑥[8+(5-2)÷1.2]×5
=[8+3÷1.2]×5
=10.5×5
=52.5