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Đáp án+Giải thích các bước giải:

 `2`,

a, `27.75 + 25.27`

`= 27(75 + 25)`

`= 27.100`

`= 2700`

b, `15.13 + 6.15 + 15`

`= 15(13 + 6 + 1)`

`= 15.20`

`= 300`

c, `(125.37.32) : 4`

`= 148000 : 4`

`= 37000`

d,`78 . (31 + 24 + 17) + 22.72`

`= 78.73 + 22.72`

`= 5694 + 1584`

`= 7278`

e, `17 + 17.99`

`= 17(1 + 99)`

`= 17.100`

`= 1700`

f, `(44.52.60) : (11.13.15)`

`= 44 : 11 . 52 : 13 . 60 : 15`

`= 4 . 4 . 4`

`= 64`

`3`

a, `64.6 + 81.4 + 17.6`

`= 6(64 + 17) + 81.4`

`= 6.81 + 81 . 4`

`= 81(6 + 4)`

`= 81.100`

`= 8100`

b, `58.18 + 42.39 - 58 - 42.22`

`= 58(18 - 1) + 42(39 - 22)`

`= 58.17 + 42.17`

`= 17(58 + 42)`

`= 17.100`

`= 1700`

c, `43.37 + 93.43 + 57.61 + 69.57`

`= 43(37 + 43) + 57(61 + 69)`

`= 43.80 + 57.130`

`= 3440 + 7410`

`= 10850`

d,`46.37 + 46.73 + 54.267 - 54.167`

`= 46(37 + 73) + 54(267 - 167)`

`= 46.100 + 54.100`

`= 100.(46 + 54)`

`= 100.100`

`= 10000`

e, `42.26 + 42.39 + 65.75 - 65.17`

`= 42(29 + 39) + 65(75 - 17)`

`= 42.65 + 65.58`

`= 65.(42 + 58)`

`= 65.100`

`= 6500`

f, `(789.36 - 1532.18) : (18.23)`

`= (789.2.18 - 1532.18) : (18.23)`

`= (1578.18 - 1532.18) : (18.23)`

`= 18(1578 - 1532) : (18.23)`

`= 18.46 : 18.23`

`= 46 : 23`

`= 2`

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