7.8+2.2=10 5÷2=2.5 -2.4×(-5)=12 -7.2-7.2=-14.4 8.4÷(-0.04)=-210
1-0.6+0.4=0.8 1.8+1.2×0.6=2.52 (1.5+0.25)×4=7 0.3×0.8÷0.3×0.8=0.64 0.38÷4.3≈0.09
7.8+2.2=10 5÷2=2.5 -2.4×(-5)=12 -7.2-7.2=-14.4 8.4÷(-0.04)=-210
1-0.6+0.4=0.8 1.8+1.2×0.6=2.52 (1.5+0.25)×4=7 0.3×0.8÷0.3×0.8=0.64 0.38÷4.3≈0.09