①6.5×8+3.5×8-44 ②907+907×9 ③(999+111)÷[56×( 3 7 - 3 8 )] ④
①6.5×8+3.5×8-44②907+907×9③(999+111)÷[56×(37-38)]④56×99⑤168.1÷(4.3×2-0.4)⑥[2-(11.9-8.4...
①6.5×8+3.5×8-44 ②907+907×9 ③(999+111)÷[56×( 3 7 - 3 8 )] ④56×99 ⑤168.1÷(4.3×2-0.4) ⑥[2-(11.9-8.4×1 1 3 )]÷1.3.
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①6.5×8+3.5×8-44 =(6.5+3.5)×8-44 =10×8-44 =80-44 =36; ②907+907×9 =907×(1+9) =907×10 =9070; ③(999+111)÷[56×(
=1110÷[56×
=1110÷3 =370; ④56×99 =56×(100-1) =56×100-56×1 =5600-56 =5544; ⑤168.1÷(4.3×2-0.4) =168.1÷(8.6-0.4) =168.1÷8.2 =20.5; ⑥[2-(11.9-8.4×1
=[2-(11.9-
=[2-(11.9-11.2)]÷1.3 =[2-0.7]÷1.3 =1.3÷1.3 =1. |
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