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8.9x4.8十2.2x2.4怎样简便计算

408-12×24 = 408 - 288 = 120 (46+28)×60 = 74 x 60 = 4440 42×50-17 = 2100- 17 = 2083 32+105÷5 = 32 + 21 = 53 420×(327-238) = 420 x 89 = 37380 (4121+2389)÷7 = 6510 ÷7 = 930 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1 0.8×[(10...

x-6.75=1.68 x=8.43 x÷2.8=5.6 x=15.68 1.2+1.2x=2.4 1.2x=1.2 x=1 4x-2.5=9.5 4x=12 x=3 0.7x+6×5=37 0.7x=7 x=10 1.2x-0.8x=4.8 0.4x=4.8 x=12

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