Question

这几道不会 写出算式 递等式能巧算就巧算

这几道不会
写出算式
递等式能巧算就巧算





Answer 1

(0.25×12.5)×40
=(0.25×4)×(12.5×8)
=1×100
=100

（4.01+1.35)×5.08

=5.36×5.08
=27.2288

18×2.8+54×2.4
=50.4+129.6
=180

36.8×24.5+368×7.55
=368×2.45+368×7.55
=(2.45+7.55)×368
=10×368
=3680

设桶重x千克，桶中油重y千克
依题意 x+y=8.4 1/2y+x=4.7
解得：x=1 y=7.4
答：桶重7.4千克，桶中油重1千克。

Answer 2

(4.01-1.35)×5.08
=2.66×5.08
=13.5128

追答

18×2.8+54×2.4
=18×4×0.7+18×3×4×0.6
=18×4×(0.7+1.8)
=18×(4×2.5)
=18×10
=180

(0.25×12.5)×40
=(0.25×4)×(12.5×8)
=1×100
=100

36.8×24.5+368×7.55
=36.8×24.5+36.8×75.5
=36.8×(24.5+75.5)
=36.8×100
=3680

(8.4-4.7)×2
=3.7×2
=7.4
8.4-7.4=1

0K？

望釆纳

Answer 3

应用乘法分配律呀!

Answer 4

Niduoda?

Answer 5