Đáp án:
`a,=210`
`b,=1000`
Giải thích các bước giải:
`a,12+34+66+98`
`=(12+98)+(34+66)`
`=(2+98+10)+100`
`=100+10+100`
`=210`
`b,100.5.2`
`=100.10`
`=1000`
a) 12 + 34 + 66 + 98
= (12 + 98) + (34 + 66)
= 110 + 100
= 210
b) 100 × 5 × 2
= 100 × (5 × 2)
= 100 × 10
= 1000
Chúc học tốt!!!
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