题目
口算。
68+2.5= 13.7-7= 5.5+23= 19-8.5=
15.7+2.3= 21.4-1.4= 5.02+4.18= 3.85-0.17=
0.3×15= 5.5×4= 9×3.1= 1.8×30=
0.2×2.5= 3.2×0.4= 0.15×0.6= 0.18×0.5=
10-4.9= 3.44+2.56= 2.4×0.15= 4.8×0.25=
答案:68+2.5=70.5 13.7-7=6.7 5.5+23=28.5 19-8.5=10.5 15.7+2.3=18 21.4-1.4=20 5.02+4.18=9.2 3.85-0.17=3.68 0.3×15=4.5 5.5×4= 22 9×3.1=27.9 1.8×30=54 0.2×2.5=0.5 3.2×0.4=1.28 0.15×0.6= 0.09 0.18×0.5=0.09 10-4.9=5.1 3.44+2.56=6 2.4×0.15=0.36 4.8×0.25=1.2