Cách `1:`
`a + a + a + a + a`
`= 4 + 4 + 4 + 4 + 4`
`= 4 × 4 + 4`
`= 16 + 4`
`= 20`
Cách `2:`
`= 4 xx 5`
Đáp án+Giải thích các bước giải:
Cách 1:
Thay a=4 vào ta được:
4+4+4+4+4=4.5=20
Cách 2:
4+4+4+4+4=4.2+4.3=4(2+3)=4.5=20
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