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8.5 5.61x2.3怎样简算?

(3.2+5.6+1.2)×0.5=5

(1)=8.69(30×0.3-1.1×0.3)=8.69(9-3.3)= 8.69-5.7=1.99 (2)=4×5.6-0.3×5.6+7.43=22.4-1.68+7.73=22.4-2+0.32+7.73=20.4+8.05=28.45 (3)=43.2-(6.3+3.7) =43.2-10=33.2 (4)=(5.46+14.54)+ (2.81-0.61)=20+2.2 =22.2 (5)=1/8×...

(2) 1 / 8 × 32 × 2.5 = 4 X 2.5 = l

=(3.2+5.6+1.2)x0.5=5

5.6x2.3=12.88

x÷3.6=2.5 x=2.5*3.6 x=9 4.98-2.3x=1.3 2.3 x=4.98-1.3 x=3.68÷2.3 x=1.6 5.6x-x=8.28 4.6x=8.28 x=8.28÷4.6 x=1.8 4(x-0.8)=9 x-0.8=9÷4 x-0.8=2.25 x=1.45

1.3×12+1.2×56+310×0.12= 1.3×12+12×5.6+3.1×12= 12×(1.3+5.6+3.1)= 12×10=120

1.23×9.1+0.77×9.4 =1.23x9.1+0.77x9.1+0.77x0.3 =9.1x(1.23+0.77)+0.231 =9.1x2+0.231 =18.2+0.231 =18.431

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