求5道小数递等式.四年级做的

52.194－64.8÷1.8×0.9
53.36.72÷4.25×9.9
54.5180－705×6
55.24÷2.4－2.5×0.8
56.(4121+2389)÷7
57.671×15-974
58.469×12+1492
59.405×(3213-3189)
60.3.416÷（0.016×35）
61.0.8×[(10－6.76)÷1.2]
62.19.4×6.1×2.3 5.67×0.2-0.62
63.18.1×0.92+3.93 0.0430.24+0.875
64.0.4×0.7×0.25 0.75×102 100-56.23
65.0.78+5.436+1 4.07×0.86+9.12.5