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| (1)0.85×201, =0.85×200+0.85×1, =170+0.85, =170.85; (2)0.5×4.85×8, =0.5×8×4.85, =4×4.85, =19.4; (3)2.5×48-48, =(2.5×4)×12-48, =10×12-48, =120-48, =72; (4)2.7+4.29+2.71+6.3, =(2.7+6.3)+(4.29+2.71). =9+7, =16; (5)1.2×3.5+8.8×3.5, =(1.2+8.8)×3.5, =10×3.5, =35. |
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