小数乘法 | 小数加、减法 | 结合律: (a+b)+c=a+(b+c) (a×b)×c=a×(b×c) | 乘法分配律 a×(b+c)=a×b+a×c a×b+a×c=a×(b+c) | 脱式计算 (按照运算顺序) |
1.14×0.7=4.5×28=7.4×20=6.2×1.4= 5.4×2.6= | 26.8+3.02=6.07-4.993=3.7+2.36=15.4+2.97=10.2-8.75= | 2.5×1.9×4 42×1.25×0.08 6.9+4.8+3.10.6+6.22+3.78 25×0.23×0.4 | (40+0.8)×2.5 12.5×(0.8+80) 30×(1.5+0.1) 3.25×23-3.25×130.28×18-8×0.28 | 12.83-(8.45-3.69) 100-(8.7+5.24) 84.06+6.47-5.19 5.43+(15.27+30.29) 2.8×1.43+0.57 |
2.3×1.4=3.7×1.8=5.2×1.6= 3.6×0.8=0.66×1.4= | 7.3-2.25=3.8+3.54=3.05-2.9=3.1-2.07=12.7+6.58= | 1.2×0.04×25 320×1.25×8 18.76-3.47-0.535.17-1.8-3.2 0.4×23×2.5 | 0.36×34+0.36×66 7.5×2.3+2.5×2.3 (1.25-0.125)×8 4.5×5.2+4.5×4.8 7.×2.5-3.×2.5 | 5.03-2.5+0.9622.8-5.23-9.25 9.29+3.7×6.3? 8.02-5.4+0.98 4.6×57+0.23×8 |
0.42×0.8=0.24×0.19=2.4×1.3=4.5×2.3= 0.72×0.27= | 28-3.56=10-0.81=10-0.36=20-0.92=8-7.0= | 0.25×21×40 1.25×21×0.8 4.02+5.4+0.985.17-1.8-3.23.68+7.56-2.68 | 6.3×43+57×6.3 17.01×9+17.01 9.71×2.3+7.7×9.71 (100-0.4)×2.5 10×(5.2+12.3) | 67.2+41.5-71.39 10.75+(0.4+9.4)16.23+8.92-7.5650-28.5×1.2 13.79-9.53+10.57 |
45×1.2=107×4.6= 76×0.37=0.28×0.27=0.75×0.42= | 96.85-85=45.45-45= 10-0.41=45-0.45=3.57+3= | 0.13×25×0.4 (24×2.5)×0.04 70.8-1.25-1.75 4.02-3.5+0.984.25-0.83+0.75 | (2.5-0.25)×0.4 7.9×10.8-0.8×7.9 18.76×9.9+18.76 (8+0.8)×12.5 26×15.7+15.7×24 | 1.5+0.68-0.672.8-8.6+5.84 20.8-(15.98-3.9)32.5+(5.07+6.1)3.52-(4.6-3.82) |
5.61×2.9=3.77×1.8=0.02×96=5.22×0.3= 9.99×0.= | 5.8-3.25=4.8+18.09=10.3+58.7=8.3-4.56=9.03-8.5= | 12.5×0.35×8 25×3.1×0.4 48.14-2.43-7.57 4×2.3×2.5 0.5×15.8×0.2 | 4.8×7.8+7.8×0.52 27.5×3.7-7.5×3.7 (0.8+8)×12.5 2.5×0.6-1.5×0.6 2.5×(40-0.4) | 3.2×0.36-4.80.56+6.2+3.78 45×21-50×2.1 5.45+2.65×2.2 0.65×90+4.2 |
5.63×70= 75.6×90= 80×0.78= 8.06×0.04= 1.33×8.9= | 5.94+10.7=12.3+0.85=37.8+3.02=0.704-0.25=10.1-0.55= | 48×0.5×0.4 47×50×0.2 4×6.32×2.5 12.5×2.5×0.8×4 0.25×12.8×0.4 | 0.93×6+0.93×4 (0.4+10)×2.53.25×23-3.25×130.28×18-8×0.28 1.25×(100+0.8) | 50.4×1.9-1.8 72×0.81+10.4 12.4-4.09×1.3 3.2×(14.7-7.65) 3.76+0.25+0.4 |
0.68×0.77= 45.6×0.26= 9.57×0.21= 38×6.75= 7.04×7.8= | 4.1+2.53=5.07-0.8=5.7-0.73=13.18+5.27=5.16+7.9= | 1.25×26×80 7.62+2.6+2.38 12-0.28-0.72 0.25×12.9×0.4 0.25×32×12.5 | 3.65×88+3.65×12 0.125×(8+0.8) 2.5×(10+0.4) 0.27×5.6+4.4×0.27 (0.4+40)×2.5 | 23.66+4.34-3.56 5.6-0.81-1.2915.9+3.26+4.17 5.83×2+4.27 1.3+4.7×0.9 |
1.42×0.25= 4.06×0.06= 60.5×2.1= 20×0.78= 2.×0.2= | 1.4-0.55=3.6+0.46=43.5-27.34=15.08-3.9=75.6-3.55= | 20.15+7.62+7.8551.27-8.66-1.34 8×(1.25×12) 0.25×4.7×40 (0.4×0.02)×2.5 | 33.3×19+33.3 2.9×2.5+17.1×2.5 (8+0.8)×12.5 2.5×12.4-2.4×2.5 (1.25-0.125)×8 | 6.9-4.8+3.1 9.29+3.7-6.3? 8.2-5.4-0.98 6.4×0.25+3.6×4 0.6+0.4×5.5 |