1.算一算,比一比。
38.45−(10.26+8.45) 38.45−8.45−10.26
=38.45−____ =___−10.26
=____ =___
38.45−(10.26+8.45)____38.45−8.45−10.26
15.46−(8.2−2.54) 15.46−8.2+2.54
=15.46−___ =____−8.2
=____ =____
15.46−(8.2−2.54)____15.46−8.2+2.54
38.45−(10.26+8.45) 38.45−8.45−10.26
=38.45−____ =___−10.26
=____ =___
38.45−(10.26+8.45)____38.45−8.45−10.26
15.46−(8.2−2.54) 15.46−8.2+2.54
=15.46−___ =____−8.2
=____ =____
15.46−(8.2−2.54)____15.46−8.2+2.54
答案:
38.45−(10.26 + 8.45)
=38.45-18.71
=19.74
38.45-8.45-10.26
=30-10.26
=19.74
38.45−(10.26 + 8.45)=38.45−8.45−10.26
15.46−(8.2−2.54)
=15.46-5.66
=9.8
15.46-8.2+2.54
=18-8.2
=9.8
15.46−(8.2−2.54)= 15.46−8.2 + 2.54
=38.45-18.71
=19.74
38.45-8.45-10.26
=30-10.26
=19.74
38.45−(10.26 + 8.45)=38.45−8.45−10.26
15.46−(8.2−2.54)
=15.46-5.66
=9.8
15.46-8.2+2.54
=18-8.2
=9.8
15.46−(8.2−2.54)= 15.46−8.2 + 2.54
2.怎样算简便就怎么算。
12.56−(2.56+4) 35.12−(6+5.12)
26.98−(10−4.02) 90.08−(66−9.92)
12.56−(2.56+4) 35.12−(6+5.12)
26.98−(10−4.02) 90.08−(66−9.92)
答案:
12.56−(2.56 + 4)
= 12.56−2.56−4
= 10−4
= 6
35.12−(6 + 5.12)
= 35.12−6−5.12
= 30−6
= 24
26.98−(10−4.02)
= 26.98−10 + 4.02
= 31−10
= 21
90.08−(66−9.92)
= 90.08−66 + 9.92
= 100−66
= 34
= 12.56−2.56−4
= 10−4
= 6
35.12−(6 + 5.12)
= 35.12−6−5.12
= 30−6
= 24
26.98−(10−4.02)
= 26.98−10 + 4.02
= 31−10
= 21
90.08−(66−9.92)
= 90.08−66 + 9.92
= 100−66
= 34
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