1.算一算。(能巧算的要巧算) (1) 9.8-3.27+12.31 (2) 6.72-3.38-

2025-02-24 04:56:33
推荐回答(3个)
回答1:

(1) 9.8-3.27+12.31=10-0.2-3-0.27+12+0.31=(10-3+12)-(0.2+0.27-0.31)=18.84

(2) 6.72-3.38-0.62=6.72-(3.38+0.62)=6.72-4=2.72

(3) 97.3+(7.3+19.5)=100-2.7+7.3+20-0.5=(100+20)+7.3-(2.7+0.5)=124.1

18.54-3.7-2.3-8.54=(18.54-8.54)-(3.7+2.3)=4

回答2:

回答3: