计算:(1)3.75×4.23×36-125×0.423×2.8(2) 1 110 + 2 110 + 3 110
计算:(1)3.75×4.23×36-125×0.423×2.8(2)1110+2110+3110+…+9110+10110-11465-12465-…-19465-20...
计算:(1)3.75×4.23×36-125×0.423×2.8(2) 1 110 + 2 110 + 3 110 +…+ 9 110 + 10 110 - 11 465 - 12 465 -…- 19 465 - 20 465 (3)如:a※b=2a-b成立,已知x※(4※1)=6,求x.(4)1030×0.125+44.3×12.5+262×1.25.
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(1)3.75×4.23×36-125×0.423×2.8, =3.75×4.23×36-12.5×4.23×2.8, =4.23×(3.75×36-12.5×2.8), =4.23×(12.5×0.3×36-12.5×2.8), =4.23×12.5×(0.3×36-2.8), =4.23×12.5×(10.8-2.8), =4.23×12.5×8, =423; (2))
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(3)根据题意可得: 4※1=4×2-1=7; x※(4※1)=x※7=2x-7=6; 2x-7=6, 2x-7+7=6+7 2x=13 2x÷2=13÷2 x=6.5; (4)1030×0.125+44.3×12.5+262×1.25, =103×1.25+443×1.25+262×1.25, =(103+443+262)×1.25, =808×1.25, =(800+8)×1.25, =800×1.25+8×1.25, =1000+10, =1010. |
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