18·76×9·9＋18·76 0·25×16·2×0·4 4·8×9·9 7·09×10·8 －0.8×7.09 4.8×100.1 4.2 ÷3.5 32

18·76×9·9＋18·76
=18·76×（9·9＋1）
=18.76×10＋18.76-18.76×0.1
=204.484
0·25×16·2×0·4
=0·25×0·4 ×16·2
=0.1×16.2
=1.62
4·8×9·9
=4.8×(10-0.1)
=4.8×10-4.8×0.1
=48-0.48
=47.52
7·09×10·8 －0.8×7.09
=7·09×(10·8 －0.8)
=7·09×10
=70.9
4.8×100.1
=4.8×100＋4.8×0.1
=480＋0.48
=480.48
4.2 ÷3.5
=4.2÷(0.7×5)
=4.2÷0.7÷5
=6÷5
=1.2

把题目表示清楚

18.76*9.9+18.76=18.76*10+18.76-1.876=187.6+18.76-1.876=204.4840.25*16.2*0.4=0.25*0.4*16.2=0.01*16.2=0.1624.8*9.9=4.8*10-0.48=48-0.48=47.527.09*10.8-0.8*7.09=7.09*(10.8-0.8)=7.09*10=70.94.8*100.1=4.8*1...