0.3x+7.8=9
3(x-2.1)=10.5
5.3x+1.6x=20.7
7.19÷0.987.19 26.7÷1.0226.7
0.99×0.990.99÷0.99 3.56÷13.56×1
180÷6= += ÷3= ×=
6﹣3.3= 2.2+3.57= ﹣= 39.5÷8≈(估算)
0.125×4= ×12= := 8×÷8×=