用递等式计算(能简算的要简算).102×4.57.8×6.9+2.2×6.95.6×0.250.654+1
用递等式计算(能简算的要简算).102×4.57.8×6.9+2.2×6.95.6×0.250.654+10.9×6.58×(20-1.25)4.2×1.5-2.74....
用递等式计算(能简算的要简算).102×4.57.8×6.9+2.2×6.95.6×0.250.654+10.9×6.58×(20-1.25)4.2×1.5-2.74.
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①102×4.5, =(100+2)×4.5, =100×4.5+2×4.5, =450+9, =459; ②7.8×6.9+2.2×6.9, =(7.8+2.2)×6.9, =10×6.9, =69; ③5.6×0.25, =1.4×4×0.25, =1.4×(4×0.25), =1.4×1, =1.4; ④0.654+10.9×6.5, =0.654+70.85, =71.504; ⑤8×(20-1.25), =8×20-8×1.25, =160-10, =150; ⑥4.2×1.5-2.74, =6.3-2.74, =3.56. |
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