=10×10
=100
(5)13.75﹣(3.75+6.48)
=13.75﹣3.75﹣6.48
=10﹣6.48
=3.52
(6)8.4× +3.2×75%﹣5.6×0.75
=8.4×0.75+3.2×75%﹣5.6×0.75
=(8.4+3.2﹣5.6)×0.75
=6×0.75
=4.5
32.【解答】解:(1)0.4×(12﹣x)=1.2
0.4×(12﹣x)÷0.4=1.2÷0.4
12﹣x=3
12﹣x+x=3+x
3+x﹣3=12﹣3
x=9;
(2) =
0.25x=125×1.6
0.25x÷0.25=200÷0.25
x=800.
33.【解答】解:(1)根据题意列式为:
(15÷30%+3)
=(50+3)×
=53×
=
所以乙数为 .
(2)(90× ﹣10)÷20%
=(75﹣10)÷20%
=65÷20%
=325
(3)3.5+6.3﹣4.7
=9.8﹣4.7
=5.1
(4)50÷(2.5×80﹣1.4)
=50÷(200﹣1.4)
=50÷198.6
=
五、解答题(共 1 小题,满分 8 分)
34.【解答】解:如图所示: